net/mac80211/mlme.c

   1 /*
   2  * BSS client mode implementation
   3  * Copyright 2003-2008, Jouni Malinen <j@w1.fi>
   4  * Copyright 2004, Instant802 Networks, Inc.
   5  * Copyright 2005, Devicescape Software, Inc.
   6  * Copyright 2006-2007  Jiri Benc <jbenc@suse.cz>
   7  * Copyright 2007, Michael Wu <flamingice@sourmilk.net>
   8  *
   9  * This program is free software; you can redistribute it and/or modify
  10  * it under the terms of the GNU General Public License version 2 as
  11  * published by the Free Software Foundation.
  12  */
  13
  14 #include <linux/delay.h>
  15 #include <linux/if_ether.h>
  16 #include <linux/skbuff.h>
  17 #include <linux/if_arp.h>
  18 #include <linux/etherdevice.h>
  19 #include <linux/moduleparam.h>
  20 #include <linux/rtnetlink.h>
  21 #include <linux/pm_qos.h>
  22 #include <linux/crc32.h>
  23 #include <linux/slab.h>
  24 #include <linux/export.h>
  25 #include <net/mac80211.h>
  26 #include <asm/unaligned.h>
  27
  28 #include "ieee80211_i.h"
  29 #include "driver-ops.h"
  30 #include "rate.h"
  31 #include "led.h"
  32
  33 #define IEEE80211_AUTH_TIMEOUT (HZ / 5)
  34 #define IEEE80211_AUTH_MAX_TRIES 3
  35 #define IEEE80211_AUTH_WAIT_ASSOC (HZ * 5)
  36 #define IEEE80211_ASSOC_TIMEOUT (HZ / 5)
  37 #define IEEE80211_ASSOC_MAX_TRIES 3
  38
  39 static int max_nullfunc_tries = 2;
  40 module_param(max_nullfunc_tries, int, 0644);
  41 MODULE_PARM_DESC(max_nullfunc_tries,
  42                  "Maximum nullfunc tx tries before disconnecting (reason 4).");
  43
  44 static int max_probe_tries = 5;
  45 module_param(max_probe_tries, int, 0644);
  46 MODULE_PARM_DESC(max_probe_tries,
  47                  "Maximum probe tries before disconnecting (reason 4).");
  48
  49 /*
  50  * Beacon loss timeout is calculated as N frames times the
  51  * advertised beacon interval.  This may need to be somewhat
  52  * higher than what hardware might detect to account for
  53  * delays in the host processing frames. But since we also
  54  * probe on beacon miss before declaring the connection lost
  55  * default to what we want.
  56  */
  57 #define IEEE80211_BEACON_LOSS_COUNT     7
  58
  59 /*
  60  * Time the connection can be idle before we probe
  61  * it to see if we can still talk to the AP.
  62  */
  63 #define IEEE80211_CONNECTION_IDLE_TIME  (30 * HZ)
  64 /*
  65  * Time we wait for a probe response after sending
  66  * a probe request because of beacon loss or for
  67  * checking the connection still works.
  68  */
  69 static int probe_wait_ms = 500;
  70 module_param(probe_wait_ms, int, 0644);
  71 MODULE_PARM_DESC(probe_wait_ms,
  72                  "Maximum time(ms) to wait for probe response"
  73                  " before disconnecting (reason 4).");
  74
  75 /*
  76  * Weight given to the latest Beacon frame when calculating average signal
  77  * strength for Beacon frames received in the current BSS. This must be
  78  * between 1 and 15.
  79  */
  80 #define IEEE80211_SIGNAL_AVE_WEIGHT     3
  81
  82 /*
  83  * How many Beacon frames need to have been used in average signal strength
  84  * before starting to indicate signal change events.
  85  */
  86 #define IEEE80211_SIGNAL_AVE_MIN_COUNT  4
  87
  88 #define TMR_RUNNING_TIMER       0
  89 #define TMR_RUNNING_CHANSW      1
  90
  91 #define DEAUTH_DISASSOC_LEN     (24 /* hdr */ + 2 /* reason */)
  92
  93 /*
  94  * All cfg80211 functions have to be called outside a locked
  95  * section so that they can acquire a lock themselves... This
  96  * is much simpler than queuing up things in cfg80211, but we
  97  * do need some indirection for that here.
  98  */
  99 enum rx_mgmt_action {
 100         /* no action required */
 101         RX_MGMT_NONE,
 102
 103         /* caller must call cfg80211_send_deauth() */
 104         RX_MGMT_CFG80211_DEAUTH,
 105
 106         /* caller must call cfg80211_send_disassoc() */
 107         RX_MGMT_CFG80211_DISASSOC,
 108
 109         /* caller must call cfg80211_send_rx_auth() */
 110         RX_MGMT_CFG80211_RX_AUTH,
 111
 112         /* caller must call cfg80211_send_rx_assoc() */
 113         RX_MGMT_CFG80211_RX_ASSOC,
 114
 115         /* caller must call cfg80211_send_assoc_timeout() */
 116         RX_MGMT_CFG80211_ASSOC_TIMEOUT,
 117 };
 118
 119 /* utils */
 120 static inline void ASSERT_MGD_MTX(struct ieee80211_if_managed *ifmgd)
 121 {
 122         lockdep_assert_held(&ifmgd->mtx);
 123 }
 124
 125 /*
 126  * We can have multiple work items (and connection probing)
 127  * scheduling this timer, but we need to take care to only
 128  * reschedule it when it should fire _earlier_ than it was
 129  * asked for before, or if it's not pending right now. This
 130  * function ensures that. Note that it then is required to
 131  * run this function for all timeouts after the first one
 132  * has happened -- the work that runs from this timer will
 133  * do that.
 134  */
 135 static void run_again(struct ieee80211_if_managed *ifmgd, unsigned long timeout)
 136 {
 137         ASSERT_MGD_MTX(ifmgd);
 138
 139         if (!timer_pending(&ifmgd->timer) ||
 140             time_before(timeout, ifmgd->timer.expires))
 141                 mod_timer(&ifmgd->timer, timeout);
 142 }
 143
 144 void ieee80211_sta_reset_beacon_monitor(struct ieee80211_sub_if_data *sdata)
 145 {
 146         if (sdata->vif.driver_flags & IEEE80211_VIF_BEACON_FILTER)
 147                 return;
 148
 149         if (sdata->local->hw.flags & IEEE80211_HW_CONNECTION_MONITOR)
 150                 return;
 151
 152         mod_timer(&sdata->u.mgd.bcn_mon_timer,
 153                   round_jiffies_up(jiffies + sdata->u.mgd.beacon_timeout));
 154 }
 155
 156 void ieee80211_sta_reset_conn_monitor(struct ieee80211_sub_if_data *sdata)
 157 {
 158         struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
 159
 160         if (unlikely(!sdata->u.mgd.associated))
 161                 return;
 162
 163         if (sdata->local->hw.flags & IEEE80211_HW_CONNECTION_MONITOR)
 164                 return;
 165
 166         mod_timer(&sdata->u.mgd.conn_mon_timer,
 167                   round_jiffies_up(jiffies + IEEE80211_CONNECTION_IDLE_TIME));
 168
 169         ifmgd->probe_send_count = 0;
 170 }
 171
 172 static int ecw2cw(int ecw)
 173 {
 174         return (1 << ecw) - 1;
 175 }
 176
 177 static u32 ieee80211_config_ht_tx(struct ieee80211_sub_if_data *sdata,
 178                                   struct ieee80211_ht_operation *ht_oper,
 179                                   const u8 *bssid, bool reconfig)
 180 {
 181         struct ieee80211_local *local = sdata->local;
 182         struct ieee80211_supported_band *sband;
 183         struct sta_info *sta;
 184         u32 changed = 0;
 185         u16 ht_opmode;
 186         bool disable_40 = false;
 187
 188         sband = local->hw.wiphy->bands[local->oper_channel->band];
 189
 190         switch (sdata->vif.bss_conf.channel_type) {
 191         case NL80211_CHAN_HT40PLUS:
 192                 if (local->oper_channel->flags & IEEE80211_CHAN_NO_HT40PLUS)
 193                         disable_40 = true;
 194                 break;
 195         case NL80211_CHAN_HT40MINUS:
 196                 if (local->oper_channel->flags & IEEE80211_CHAN_NO_HT40MINUS)
 197                         disable_40 = true;
 198                 break;
 199         default:
 200                 break;
 201         }
 202
 203         /* This can change during the lifetime of the BSS */
 204         if (!(ht_oper->ht_param & IEEE80211_HT_PARAM_CHAN_WIDTH_ANY))
 205                 disable_40 = true;
 206
 207         mutex_lock(&local->sta_mtx);
 208         sta = sta_info_get(sdata, bssid);
 209
 210         WARN_ON_ONCE(!sta);
 211
 212         if (sta && !sta->supports_40mhz)
 213                 disable_40 = true;
 214
 215         if (sta && (!reconfig ||
 216                     (disable_40 != !(sta->sta.ht_cap.cap &
 217                                         IEEE80211_HT_CAP_SUP_WIDTH_20_40)))) {
 218
 219                 if (disable_40)
 220                         sta->sta.ht_cap.cap &= ~IEEE80211_HT_CAP_SUP_WIDTH_20_40;
 221                 else
 222                         sta->sta.ht_cap.cap |= IEEE80211_HT_CAP_SUP_WIDTH_20_40;
 223
 224                 rate_control_rate_update(local, sband, sta,
 225                                          IEEE80211_RC_BW_CHANGED);
 226         }
 227         mutex_unlock(&local->sta_mtx);
 228
 229         ht_opmode = le16_to_cpu(ht_oper->operation_mode);
 230
 231         /* if bss configuration changed store the new one */
 232         if (!reconfig || (sdata->vif.bss_conf.ht_operation_mode != ht_opmode)) {
 233                 changed |= BSS_CHANGED_HT;
 234                 sdata->vif.bss_conf.ht_operation_mode = ht_opmode;
 235         }
 236
 237         return changed;
 238 }
 239
 240 /* frame sending functions */
 241
 242 static int ieee80211_compatible_rates(const u8 *supp_rates, int supp_rates_len,
 243                                       struct ieee80211_supported_band *sband,
 244                                       u32 *rates)
 245 {
 246         int i, j, count;
 247         *rates = 0;
 248         count = 0;
 249         for (i = 0; i < supp_rates_len; i++) {
 250                 int rate = (supp_rates[i] & 0x7F) * 5;
 251
 252                 for (j = 0; j < sband->n_bitrates; j++)
 253                         if (sband->bitrates[j].bitrate == rate) {
 254                                 *rates |= BIT(j);
 255                                 count++;
 256                                 break;
 257                         }
 258         }
 259
 260         return count;
 261 }
 262
 263 static void ieee80211_add_ht_ie(struct ieee80211_sub_if_data *sdata,
 264                                 struct sk_buff *skb, u8 ap_ht_param,
 265                                 struct ieee80211_supported_band *sband,
 266                                 struct ieee80211_channel *channel,
 267                                 enum ieee80211_smps_mode smps)
 268 {
 269         u8 *pos;
 270         u32 flags = channel->flags;
 271         u16 cap;
 272         struct ieee80211_sta_ht_cap ht_cap;
 273
 274         BUILD_BUG_ON(sizeof(ht_cap) != sizeof(sband->ht_cap));
 275
 276         memcpy(&ht_cap, &sband->ht_cap, sizeof(ht_cap));
 277         ieee80211_apply_htcap_overrides(sdata, &ht_cap);
 278
 279         /* determine capability flags */
 280         cap = ht_cap.cap;
 281
 282         switch (ap_ht_param & IEEE80211_HT_PARAM_CHA_SEC_OFFSET) {
 283         case IEEE80211_HT_PARAM_CHA_SEC_ABOVE:
 284                 if (flags & IEEE80211_CHAN_NO_HT40PLUS) {
 285                         cap &= ~IEEE80211_HT_CAP_SUP_WIDTH_20_40;
 286                         cap &= ~IEEE80211_HT_CAP_SGI_40;
 287                 }
 288                 break;
 289         case IEEE80211_HT_PARAM_CHA_SEC_BELOW:
 290                 if (flags & IEEE80211_CHAN_NO_HT40MINUS) {
 291                         cap &= ~IEEE80211_HT_CAP_SUP_WIDTH_20_40;
 292                         cap &= ~IEEE80211_HT_CAP_SGI_40;
 293                 }
 294                 break;
 295         }
 296
 297         /*
 298          * If 40 MHz was disabled associate as though we weren't
 299          * capable of 40 MHz -- some broken APs will never fall
 300          * back to trying to transmit in 20 MHz.
 301          */
 302         if (sdata->u.mgd.flags & IEEE80211_STA_DISABLE_40MHZ) {
 303                 cap &= ~IEEE80211_HT_CAP_SUP_WIDTH_20_40;
 304                 cap &= ~IEEE80211_HT_CAP_SGI_40;
 305         }
 306
 307         /* set SM PS mode properly */
 308         cap &= ~IEEE80211_HT_CAP_SM_PS;
 309         switch (smps) {
 310         case IEEE80211_SMPS_AUTOMATIC:
 311         case IEEE80211_SMPS_NUM_MODES:
 312                 WARN_ON(1);
 313         case IEEE80211_SMPS_OFF:
 314                 cap |= WLAN_HT_CAP_SM_PS_DISABLED <<
 315                         IEEE80211_HT_CAP_SM_PS_SHIFT;
 316                 break;
 317         case IEEE80211_SMPS_STATIC:
 318                 cap |= WLAN_HT_CAP_SM_PS_STATIC <<
 319                         IEEE80211_HT_CAP_SM_PS_SHIFT;
 320                 break;
 321         case IEEE80211_SMPS_DYNAMIC:
 322                 cap |= WLAN_HT_CAP_SM_PS_DYNAMIC <<
 323                         IEEE80211_HT_CAP_SM_PS_SHIFT;
 324                 break;
 325         }
 326
 327         /* reserve and fill IE */
 328         pos = skb_put(skb, sizeof(struct ieee80211_ht_cap) + 2);
 329         ieee80211_ie_build_ht_cap(pos, &ht_cap, cap);
 330 }
 331
 332 static void ieee80211_add_vht_ie(struct ieee80211_sub_if_data *sdata,
 333                                  struct sk_buff *skb,
 334                                  struct ieee80211_supported_band *sband)
 335 {
 336         u8 *pos;
 337         u32 cap;
 338         struct ieee80211_sta_vht_cap vht_cap;
 339
 340         BUILD_BUG_ON(sizeof(vht_cap) != sizeof(sband->vht_cap));
 341
 342         memcpy(&vht_cap, &sband->vht_cap, sizeof(vht_cap));
 343
 344         /* determine capability flags */
 345         cap = vht_cap.cap;
 346
 347         /* reserve and fill IE */
 348         pos = skb_put(skb, sizeof(struct ieee80211_vht_capabilities) + 2);
 349         ieee80211_ie_build_vht_cap(pos, &vht_cap, cap);
 350 }
 351
 352 static void ieee80211_send_assoc(struct ieee80211_sub_if_data *sdata)
 353 {
 354         struct ieee80211_local *local = sdata->local;
 355         struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
 356         struct ieee80211_mgd_assoc_data *assoc_data = ifmgd->assoc_data;
 357         struct sk_buff *skb;
 358         struct ieee80211_mgmt *mgmt;
 359         u8 *pos, qos_info;
 360         size_t offset = 0, noffset;
 361         int i, count, rates_len, supp_rates_len;
 362         u16 capab;
 363         struct ieee80211_supported_band *sband;
 364         u32 rates = 0;
 365
 366         lockdep_assert_held(&ifmgd->mtx);
 367
 368         sband = local->hw.wiphy->bands[local->oper_channel->band];
 369
 370         if (assoc_data->supp_rates_len) {
 371                 /*
 372                  * Get all rates supported by the device and the AP as
 373                  * some APs don't like getting a superset of their rates
 374                  * in the association request (e.g. D-Link DAP 1353 in
 375                  * b-only mode)...
 376                  */
 377                 rates_len = ieee80211_compatible_rates(assoc_data->supp_rates,
 378                                                        assoc_data->supp_rates_len,
 379                                                        sband, &rates);
 380         } else {
 381                 /*
 382                  * In case AP not provide any supported rates information
 383                  * before association, we send information element(s) with
 384                  * all rates that we support.
 385                  */
 386                 rates = ~0;
 387                 rates_len = sband->n_bitrates;
 388         }
 389
 390         skb = alloc_skb(local->hw.extra_tx_headroom +
 391                         sizeof(*mgmt) + /* bit too much but doesn't matter */
 392                         2 + assoc_data->ssid_len + /* SSID */
 393                         4 + rates_len + /* (extended) rates */
 394                         4 + /* power capability */
 395                         2 + 2 * sband->n_channels + /* supported channels */
 396                         2 + sizeof(struct ieee80211_ht_cap) + /* HT */
 397                         2 + sizeof(struct ieee80211_vht_capabilities) + /* VHT */
 398                         assoc_data->ie_len + /* extra IEs */
 399                         9, /* WMM */
 400                         GFP_KERNEL);
 401         if (!skb)
 402                 return;
 403
 404         skb_reserve(skb, local->hw.extra_tx_headroom);
 405
 406         capab = WLAN_CAPABILITY_ESS;
 407
 408         if (sband->band == IEEE80211_BAND_2GHZ) {
 409                 if (!(local->hw.flags & IEEE80211_HW_2GHZ_SHORT_SLOT_INCAPABLE))
 410                         capab |= WLAN_CAPABILITY_SHORT_SLOT_TIME;
 411                 if (!(local->hw.flags & IEEE80211_HW_2GHZ_SHORT_PREAMBLE_INCAPABLE))
 412                         capab |= WLAN_CAPABILITY_SHORT_PREAMBLE;
 413         }
 414
 415         if (assoc_data->capability & WLAN_CAPABILITY_PRIVACY)
 416                 capab |= WLAN_CAPABILITY_PRIVACY;
 417
 418         if ((assoc_data->capability & WLAN_CAPABILITY_SPECTRUM_MGMT) &&
 419             (local->hw.flags & IEEE80211_HW_SPECTRUM_MGMT))
 420                 capab |= WLAN_CAPABILITY_SPECTRUM_MGMT;
 421
 422         mgmt = (struct ieee80211_mgmt *) skb_put(skb, 24);
 423         memset(mgmt, 0, 24);
 424         memcpy(mgmt->da, assoc_data->bss->bssid, ETH_ALEN);
 425         memcpy(mgmt->sa, sdata->vif.addr, ETH_ALEN);
 426         memcpy(mgmt->bssid, assoc_data->bss->bssid, ETH_ALEN);
 427
 428         if (!is_zero_ether_addr(assoc_data->prev_bssid)) {
 429                 skb_put(skb, 10);
 430                 mgmt->frame_control = cpu_to_le16(IEEE80211_FTYPE_MGMT |
 431                                                   IEEE80211_STYPE_REASSOC_REQ);
 432                 mgmt->u.reassoc_req.capab_info = cpu_to_le16(capab);
 433                 mgmt->u.reassoc_req.listen_interval =
 434                                 cpu_to_le16(local->hw.conf.listen_interval);
 435                 memcpy(mgmt->u.reassoc_req.current_ap, assoc_data->prev_bssid,
 436                        ETH_ALEN);
 437         } else {
 438                 skb_put(skb, 4);
 439                 mgmt->frame_control = cpu_to_le16(IEEE80211_FTYPE_MGMT |
 440                                                   IEEE80211_STYPE_ASSOC_REQ);
 441                 mgmt->u.assoc_req.capab_info = cpu_to_le16(capab);
 442                 mgmt->u.assoc_req.listen_interval =
 443                                 cpu_to_le16(local->hw.conf.listen_interval);
 444         }
 445
 446         /* SSID */
 447         pos = skb_put(skb, 2 + assoc_data->ssid_len);
 448         *pos++ = WLAN_EID_SSID;
 449         *pos++ = assoc_data->ssid_len;
 450         memcpy(pos, assoc_data->ssid, assoc_data->ssid_len);
 451
 452         /* add all rates which were marked to be used above */
 453         supp_rates_len = rates_len;
 454         if (supp_rates_len > 8)
 455                 supp_rates_len = 8;
 456
 457         pos = skb_put(skb, supp_rates_len + 2);
 458         *pos++ = WLAN_EID_SUPP_RATES;
 459         *pos++ = supp_rates_len;
 460
 461         count = 0;
 462         for (i = 0; i < sband->n_bitrates; i++) {
 463                 if (BIT(i) & rates) {
 464                         int rate = sband->bitrates[i].bitrate;
 465                         *pos++ = (u8) (rate / 5);
 466                         if (++count == 8)
 467                                 break;
 468                 }
 469         }
 470
 471         if (rates_len > count) {
 472                 pos = skb_put(skb, rates_len - count + 2);
 473                 *pos++ = WLAN_EID_EXT_SUPP_RATES;
 474                 *pos++ = rates_len - count;
 475
 476                 for (i++; i < sband->n_bitrates; i++) {
 477                         if (BIT(i) & rates) {
 478                                 int rate = sband->bitrates[i].bitrate;
 479                                 *pos++ = (u8) (rate / 5);
 480                         }
 481                 }
 482         }
 483
 484         if (capab & WLAN_CAPABILITY_SPECTRUM_MGMT) {
 485                 /* 1. power capabilities */
 486                 pos = skb_put(skb, 4);
 487                 *pos++ = WLAN_EID_PWR_CAPABILITY;
 488                 *pos++ = 2;
 489                 *pos++ = 0; /* min tx power */
 490                 *pos++ = local->oper_channel->max_power; /* max tx power */
 491
 492                 /* 2. supported channels */
 493                 /* TODO: get this in reg domain format */
 494                 pos = skb_put(skb, 2 * sband->n_channels + 2);
 495                 *pos++ = WLAN_EID_SUPPORTED_CHANNELS;
 496                 *pos++ = 2 * sband->n_channels;
 497                 for (i = 0; i < sband->n_channels; i++) {
 498                         *pos++ = ieee80211_frequency_to_channel(
 499                                         sband->channels[i].center_freq);
 500                         *pos++ = 1; /* one channel in the subband*/
 501                 }
 502         }
 503
 504         /* if present, add any custom IEs that go before HT */
 505         if (assoc_data->ie_len && assoc_data->ie) {
 506                 static const u8 before_ht[] = {
 507                         WLAN_EID_SSID,
 508                         WLAN_EID_SUPP_RATES,
 509                         WLAN_EID_EXT_SUPP_RATES,
 510                         WLAN_EID_PWR_CAPABILITY,
 511                         WLAN_EID_SUPPORTED_CHANNELS,
 512                         WLAN_EID_RSN,
 513                         WLAN_EID_QOS_CAPA,
 514                         WLAN_EID_RRM_ENABLED_CAPABILITIES,
 515                         WLAN_EID_MOBILITY_DOMAIN,
 516                         WLAN_EID_SUPPORTED_REGULATORY_CLASSES,
 517                 };
 518                 noffset = ieee80211_ie_split(assoc_data->ie, assoc_data->ie_len,
 519                                              before_ht, ARRAY_SIZE(before_ht),
 520                                              offset);
 521                 pos = skb_put(skb, noffset - offset);
 522                 memcpy(pos, assoc_data->ie + offset, noffset - offset);
 523                 offset = noffset;
 524         }
 525
 526         if (!(ifmgd->flags & IEEE80211_STA_DISABLE_11N))
 527                 ieee80211_add_ht_ie(sdata, skb, assoc_data->ap_ht_param,
 528                                     sband, local->oper_channel, ifmgd->ap_smps);
 529
 530         if (!(ifmgd->flags & IEEE80211_STA_DISABLE_VHT))
 531                 ieee80211_add_vht_ie(sdata, skb, sband);
 532
 533         /* if present, add any custom non-vendor IEs that go after HT */
 534         if (assoc_data->ie_len && assoc_data->ie) {
 535                 noffset = ieee80211_ie_split_vendor(assoc_data->ie,
 536                                                     assoc_data->ie_len,
 537                                                     offset);
 538                 pos = skb_put(skb, noffset - offset);
 539                 memcpy(pos, assoc_data->ie + offset, noffset - offset);
 540                 offset = noffset;
 541         }
 542
 543         if (assoc_data->wmm) {
 544                 if (assoc_data->uapsd) {
 545                         qos_info = ifmgd->uapsd_queues;
 546                         qos_info |= (ifmgd->uapsd_max_sp_len <<
 547                                      IEEE80211_WMM_IE_STA_QOSINFO_SP_SHIFT);
 548                 } else {
 549                         qos_info = 0;
 550                 }
 551
 552                 pos = skb_put(skb, 9);
 553                 *pos++ = WLAN_EID_VENDOR_SPECIFIC;
 554                 *pos++ = 7; /* len */
 555                 *pos++ = 0x00; /* Microsoft OUI 00:50:F2 */
 556                 *pos++ = 0x50;
 557                 *pos++ = 0xf2;
 558                 *pos++ = 2; /* WME */
 559                 *pos++ = 0; /* WME info */
 560                 *pos++ = 1; /* WME ver */
 561                 *pos++ = qos_info;
 562         }
 563
 564         /* add any remaining custom (i.e. vendor specific here) IEs */
 565         if (assoc_data->ie_len && assoc_data->ie) {
 566                 noffset = assoc_data->ie_len;
 567                 pos = skb_put(skb, noffset - offset);
 568                 memcpy(pos, assoc_data->ie + offset, noffset - offset);
 569         }
 570
 571         drv_mgd_prepare_tx(local, sdata);
 572
 573         IEEE80211_SKB_CB(skb)->flags |= IEEE80211_TX_INTFL_DONT_ENCRYPT;
 574         ieee80211_tx_skb(sdata, skb);
 575 }
 576
 577 static void ieee80211_send_deauth_disassoc(struct ieee80211_sub_if_data *sdata,
 578                                            const u8 *bssid, u16 stype,
 579                                            u16 reason, bool send_frame,
 580                                            u8 *frame_buf)
 581 {
 582         struct ieee80211_local *local = sdata->local;
 583         struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
 584         struct sk_buff *skb;
 585         struct ieee80211_mgmt *mgmt = (void *)frame_buf;
 586
 587         /* build frame */
 588         mgmt->frame_control = cpu_to_le16(IEEE80211_FTYPE_MGMT | stype);
 589         mgmt->duration = 0; /* initialize only */
 590         mgmt->seq_ctrl = 0; /* initialize only */
 591         memcpy(mgmt->da, bssid, ETH_ALEN);
 592         memcpy(mgmt->sa, sdata->vif.addr, ETH_ALEN);
 593         memcpy(mgmt->bssid, bssid, ETH_ALEN);
 594         /* u.deauth.reason_code == u.disassoc.reason_code */
 595         mgmt->u.deauth.reason_code = cpu_to_le16(reason);
 596
 597         if (send_frame) {
 598                 skb = dev_alloc_skb(local->hw.extra_tx_headroom +
 599                                     DEAUTH_DISASSOC_LEN);
 600                 if (!skb)
 601                         return;
 602
 603                 skb_reserve(skb, local->hw.extra_tx_headroom);
 604
 605                 /* copy in frame */
 606                 memcpy(skb_put(skb, DEAUTH_DISASSOC_LEN),
 607                        mgmt, DEAUTH_DISASSOC_LEN);
 608
 609                 if (!(ifmgd->flags & IEEE80211_STA_MFP_ENABLED))
 610                         IEEE80211_SKB_CB(skb)->flags |=
 611                                 IEEE80211_TX_INTFL_DONT_ENCRYPT;
 612
 613                 ieee80211_tx_skb(sdata, skb);
 614         }
 615 }
 616
 617 void ieee80211_send_pspoll(struct ieee80211_local *local,
 618                            struct ieee80211_sub_if_data *sdata)
 619 {
 620         struct ieee80211_pspoll *pspoll;
 621         struct sk_buff *skb;
 622
 623         skb = ieee80211_pspoll_get(&local->hw, &sdata->vif);
 624         if (!skb)
 625                 return;
 626
 627         pspoll = (struct ieee80211_pspoll *) skb->data;
 628         pspoll->frame_control |= cpu_to_le16(IEEE80211_FCTL_PM);
 629
 630         IEEE80211_SKB_CB(skb)->flags |= IEEE80211_TX_INTFL_DONT_ENCRYPT;
 631         ieee80211_tx_skb(sdata, skb);
 632 }
 633
 634 void ieee80211_send_nullfunc(struct ieee80211_local *local,
 635                              struct ieee80211_sub_if_data *sdata,
 636                              int powersave)
 637 {
 638         struct sk_buff *skb;
 639         struct ieee80211_hdr_3addr *nullfunc;
 640         struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
 641
 642         skb = ieee80211_nullfunc_get(&local->hw, &sdata->vif);
 643         if (!skb)
 644                 return;
 645
 646         nullfunc = (struct ieee80211_hdr_3addr *) skb->data;
 647         if (powersave)
 648                 nullfunc->frame_control |= cpu_to_le16(IEEE80211_FCTL_PM);
 649
 650         IEEE80211_SKB_CB(skb)->flags |= IEEE80211_TX_INTFL_DONT_ENCRYPT;
 651         if (ifmgd->flags & (IEEE80211_STA_BEACON_POLL |
 652                             IEEE80211_STA_CONNECTION_POLL))
 653                 IEEE80211_SKB_CB(skb)->flags |= IEEE80211_TX_CTL_USE_MINRATE;
 654
 655         ieee80211_tx_skb(sdata, skb);
 656 }
 657
 658 static void ieee80211_send_4addr_nullfunc(struct ieee80211_local *local,
 659                                           struct ieee80211_sub_if_data *sdata)
 660 {
 661         struct sk_buff *skb;
 662         struct ieee80211_hdr *nullfunc;
 663         __le16 fc;
 664
 665         if (WARN_ON(sdata->vif.type != NL80211_IFTYPE_STATION))
 666                 return;
 667
 668         skb = dev_alloc_skb(local->hw.extra_tx_headroom + 30);
 669         if (!skb)
 670                 return;
 671
 672         skb_reserve(skb, local->hw.extra_tx_headroom);
 673
 674         nullfunc = (struct ieee80211_hdr *) skb_put(skb, 30);
 675         memset(nullfunc, 0, 30);
 676         fc = cpu_to_le16(IEEE80211_FTYPE_DATA | IEEE80211_STYPE_NULLFUNC |
 677                          IEEE80211_FCTL_FROMDS | IEEE80211_FCTL_TODS);
 678         nullfunc->frame_control = fc;
 679         memcpy(nullfunc->addr1, sdata->u.mgd.bssid, ETH_ALEN);
 680         memcpy(nullfunc->addr2, sdata->vif.addr, ETH_ALEN);
 681         memcpy(nullfunc->addr3, sdata->u.mgd.bssid, ETH_ALEN);
 682         memcpy(nullfunc->addr4, sdata->vif.addr, ETH_ALEN);
 683
 684         IEEE80211_SKB_CB(skb)->flags |= IEEE80211_TX_INTFL_DONT_ENCRYPT;
 685         ieee80211_tx_skb(sdata, skb);
 686 }
 687
 688 /* spectrum management related things */
 689 static void ieee80211_chswitch_work(struct work_struct *work)
 690 {
 691         struct ieee80211_sub_if_data *sdata =
 692                 container_of(work, struct ieee80211_sub_if_data, u.mgd.chswitch_work);
 693         struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
 694
 695         if (!ieee80211_sdata_running(sdata))
 696                 return;
 697
 698         mutex_lock(&ifmgd->mtx);
 699         if (!ifmgd->associated)
 700                 goto out;
 701
 702         sdata->local->oper_channel = sdata->local->csa_channel;
 703         if (!sdata->local->ops->channel_switch) {
 704                 /* call "hw_config" only if doing sw channel switch */
 705                 ieee80211_hw_config(sdata->local,
 706                         IEEE80211_CONF_CHANGE_CHANNEL);
 707         } else {
 708                 /* update the device channel directly */
 709                 sdata->local->hw.conf.channel = sdata->local->oper_channel;
 710         }
 711
 712         /* XXX: shouldn't really modify cfg80211-owned data! */
 713         ifmgd->associated->channel = sdata->local->oper_channel;
 714
 715         /* XXX: wait for a beacon first? */
 716         ieee80211_wake_queues_by_reason(&sdata->local->hw,
 717                                         IEEE80211_QUEUE_STOP_REASON_CSA);
 718  out:
 719         ifmgd->flags &= ~IEEE80211_STA_CSA_RECEIVED;
 720         mutex_unlock(&ifmgd->mtx);
 721 }
 722
 723 void ieee80211_chswitch_done(struct ieee80211_vif *vif, bool success)
 724 {
 725         struct ieee80211_sub_if_data *sdata;
 726         struct ieee80211_if_managed *ifmgd;
 727
 728         sdata = vif_to_sdata(vif);
 729         ifmgd = &sdata->u.mgd;
 730
 731         trace_api_chswitch_done(sdata, success);
 732         if (!success) {
 733                 /*
 734                  * If the channel switch was not successful, stay
 735                  * around on the old channel. We currently lack
 736                  * good handling of this situation, possibly we
 737                  * should just drop the association.
 738                  */
 739                 sdata->local->csa_channel = sdata->local->oper_channel;
 740         }
 741
 742         ieee80211_queue_work(&sdata->local->hw, &ifmgd->chswitch_work);
 743 }
 744 EXPORT_SYMBOL(ieee80211_chswitch_done);
 745
 746 static void ieee80211_chswitch_timer(unsigned long data)
 747 {
 748         struct ieee80211_sub_if_data *sdata =
 749                 (struct ieee80211_sub_if_data *) data;
 750         struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
 751
 752         if (sdata->local->quiescing) {
 753                 set_bit(TMR_RUNNING_CHANSW, &ifmgd->timers_running);
 754                 return;
 755         }
 756
 757         ieee80211_queue_work(&sdata->local->hw, &ifmgd->chswitch_work);
 758 }
 759
 760 void ieee80211_sta_process_chanswitch(struct ieee80211_sub_if_data *sdata,
 761                                       struct ieee80211_channel_sw_ie *sw_elem,
 762                                       struct ieee80211_bss *bss,
 763                                       u64 timestamp)
 764 {
 765         struct cfg80211_bss *cbss =
 766                 container_of((void *)bss, struct cfg80211_bss, priv);
 767         struct ieee80211_channel *new_ch;
 768         struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
 769         int new_freq = ieee80211_channel_to_frequency(sw_elem->new_ch_num,
 770                                                       cbss->channel->band);
 771
 772         ASSERT_MGD_MTX(ifmgd);
 773
 774         if (!ifmgd->associated)
 775                 return;
 776
 777         if (sdata->local->scanning)
 778                 return;
 779
 780         /* Disregard subsequent beacons if we are already running a timer
 781            processing a CSA */
 782
 783         if (ifmgd->flags & IEEE80211_STA_CSA_RECEIVED)
 784                 return;
 785
 786         new_ch = ieee80211_get_channel(sdata->local->hw.wiphy, new_freq);
 787         if (!new_ch || new_ch->flags & IEEE80211_CHAN_DISABLED)
 788                 return;
 789
 790         sdata->local->csa_channel = new_ch;
 791
 792         ifmgd->flags |= IEEE80211_STA_CSA_RECEIVED;
 793
 794         if (sw_elem->mode)
 795                 ieee80211_stop_queues_by_reason(&sdata->local->hw,
 796                                 IEEE80211_QUEUE_STOP_REASON_CSA);
 797
 798         if (sdata->local->ops->channel_switch) {
 799                 /* use driver's channel switch callback */
 800                 struct ieee80211_channel_switch ch_switch = {
 801                         .timestamp = timestamp,
 802                         .block_tx = sw_elem->mode,
 803                         .channel = new_ch,
 804                         .count = sw_elem->count,
 805                 };
 806
 807                 drv_channel_switch(sdata->local, &ch_switch);
 808                 return;
 809         }
 810
 811         /* channel switch handled in software */
 812         if (sw_elem->count <= 1)
 813                 ieee80211_queue_work(&sdata->local->hw, &ifmgd->chswitch_work);
 814         else
 815                 mod_timer(&ifmgd->chswitch_timer,
 816                           TU_TO_EXP_TIME(sw_elem->count *
 817                                          cbss->beacon_interval));
 818 }
 819
 820 static void ieee80211_handle_pwr_constr(struct ieee80211_sub_if_data *sdata,
 821                                         u16 capab_info, u8 *pwr_constr_elem,
 822                                         u8 pwr_constr_elem_len)
 823 {
 824         struct ieee80211_conf *conf = &sdata->local->hw.conf;
 825
 826         if (!(capab_info & WLAN_CAPABILITY_SPECTRUM_MGMT))
 827                 return;
 828
 829         /* Power constraint IE length should be 1 octet */
 830         if (pwr_constr_elem_len != 1)
 831                 return;
 832
 833         if ((*pwr_constr_elem <= conf->channel->max_reg_power) &&
 834             (*pwr_constr_elem != sdata->local->power_constr_level)) {
 835                 sdata->local->power_constr_level = *pwr_constr_elem;
 836                 ieee80211_hw_config(sdata->local, 0);
 837         }
 838 }
 839
 840 void ieee80211_enable_dyn_ps(struct ieee80211_vif *vif)
 841 {
 842         struct ieee80211_sub_if_data *sdata = vif_to_sdata(vif);
 843         struct ieee80211_local *local = sdata->local;
 844         struct ieee80211_conf *conf = &local->hw.conf;
 845
 846         WARN_ON(sdata->vif.type != NL80211_IFTYPE_STATION ||
 847                 !(local->hw.flags & IEEE80211_HW_SUPPORTS_PS) ||
 848                 (local->hw.flags & IEEE80211_HW_SUPPORTS_DYNAMIC_PS));
 849
 850         local->disable_dynamic_ps = false;
 851         conf->dynamic_ps_timeout = local->dynamic_ps_user_timeout;
 852 }
 853 EXPORT_SYMBOL(ieee80211_enable_dyn_ps);
 854
 855 void ieee80211_disable_dyn_ps(struct ieee80211_vif *vif)
 856 {
 857         struct ieee80211_sub_if_data *sdata = vif_to_sdata(vif);
 858         struct ieee80211_local *local = sdata->local;
 859         struct ieee80211_conf *conf = &local->hw.conf;
 860
 861         WARN_ON(sdata->vif.type != NL80211_IFTYPE_STATION ||
 862                 !(local->hw.flags & IEEE80211_HW_SUPPORTS_PS) ||
 863                 (local->hw.flags & IEEE80211_HW_SUPPORTS_DYNAMIC_PS));
 864
 865         local->disable_dynamic_ps = true;
 866         conf->dynamic_ps_timeout = 0;
 867         del_timer_sync(&local->dynamic_ps_timer);
 868         ieee80211_queue_work(&local->hw,
 869                              &local->dynamic_ps_enable_work);
 870 }
 871 EXPORT_SYMBOL(ieee80211_disable_dyn_ps);
 872
 873 /* powersave */
 874 static void ieee80211_enable_ps(struct ieee80211_local *local,
 875                                 struct ieee80211_sub_if_data *sdata)
 876 {
 877         struct ieee80211_conf *conf = &local->hw.conf;
 878
 879         /*
 880          * If we are scanning right now then the parameters will
 881          * take effect when scan finishes.
 882          */
 883         if (local->scanning)
 884                 return;
 885
 886         if (conf->dynamic_ps_timeout > 0 &&
 887             !(local->hw.flags & IEEE80211_HW_SUPPORTS_DYNAMIC_PS)) {
 888                 mod_timer(&local->dynamic_ps_timer, jiffies +
 889                           msecs_to_jiffies(conf->dynamic_ps_timeout));
 890         } else {
 891                 if (local->hw.flags & IEEE80211_HW_PS_NULLFUNC_STACK)
 892                         ieee80211_send_nullfunc(local, sdata, 1);
 893
 894                 if ((local->hw.flags & IEEE80211_HW_PS_NULLFUNC_STACK) &&
 895                     (local->hw.flags & IEEE80211_HW_REPORTS_TX_ACK_STATUS))
 896                         return;
 897
 898                 conf->flags |= IEEE80211_CONF_PS;
 899                 ieee80211_hw_config(local, IEEE80211_CONF_CHANGE_PS);
 900         }
 901 }
 902
 903 static void ieee80211_change_ps(struct ieee80211_local *local)
 904 {
 905         struct ieee80211_conf *conf = &local->hw.conf;
 906
 907         if (local->ps_sdata) {
 908                 ieee80211_enable_ps(local, local->ps_sdata);
 909         } else if (conf->flags & IEEE80211_CONF_PS) {
 910                 conf->flags &= ~IEEE80211_CONF_PS;
 911                 ieee80211_hw_config(local, IEEE80211_CONF_CHANGE_PS);
 912                 del_timer_sync(&local->dynamic_ps_timer);
 913                 cancel_work_sync(&local->dynamic_ps_enable_work);
 914         }
 915 }
 916
 917 static bool ieee80211_powersave_allowed(struct ieee80211_sub_if_data *sdata)
 918 {
 919         struct ieee80211_if_managed *mgd = &sdata->u.mgd;
 920         struct sta_info *sta = NULL;
 921         bool authorized = false;
 922
 923         if (!mgd->powersave)
 924                 return false;
 925
 926         if (mgd->broken_ap)
 927                 return false;
 928
 929         if (!mgd->associated)
 930                 return false;
 931
 932         if (mgd->flags & (IEEE80211_STA_BEACON_POLL |
 933                           IEEE80211_STA_CONNECTION_POLL))
 934                 return false;
 935
 936         rcu_read_lock();
 937         sta = sta_info_get(sdata, mgd->bssid);
 938         if (sta)
 939                 authorized = test_sta_flag(sta, WLAN_STA_AUTHORIZED);
 940         rcu_read_unlock();
 941
 942         return authorized;
 943 }
 944
 945 /* need to hold RTNL or interface lock */
 946 void ieee80211_recalc_ps(struct ieee80211_local *local, s32 latency)
 947 {
 948         struct ieee80211_sub_if_data *sdata, *found = NULL;
 949         int count = 0;
 950         int timeout;
 951
 952         if (!(local->hw.flags & IEEE80211_HW_SUPPORTS_PS)) {
 953                 local->ps_sdata = NULL;
 954                 return;
 955         }
 956
 957         list_for_each_entry(sdata, &local->interfaces, list) {
 958                 if (!ieee80211_sdata_running(sdata))
 959                         continue;
 960                 if (sdata->vif.type == NL80211_IFTYPE_AP) {
 961                         /* If an AP vif is found, then disable PS
 962                          * by setting the count to zero thereby setting
 963                          * ps_sdata to NULL.
 964                          */
 965                         count = 0;
 966                         break;
 967                 }
 968                 if (sdata->vif.type != NL80211_IFTYPE_STATION)
 969                         continue;
 970                 found = sdata;
 971                 count++;
 972         }
 973
 974         if (count == 1 && ieee80211_powersave_allowed(found)) {
 975                 struct ieee80211_conf *conf = &local->hw.conf;
 976                 s32 beaconint_us;
 977
 978                 if (latency < 0)
 979                         latency = pm_qos_request(PM_QOS_NETWORK_LATENCY);
 980
 981                 beaconint_us = ieee80211_tu_to_usec(
 982                                         found->vif.bss_conf.beacon_int);
 983
 984                 timeout = local->dynamic_ps_forced_timeout;
 985                 if (timeout < 0) {
 986                         /*
 987                          * Go to full PSM if the user configures a very low
 988                          * latency requirement.
 989                          * The 2000 second value is there for compatibility
 990                          * until the PM_QOS_NETWORK_LATENCY is configured
 991                          * with real values.
 992                          */
 993                         if (latency > (1900 * USEC_PER_MSEC) &&
 994                             latency != (2000 * USEC_PER_SEC))
 995                                 timeout = 0;
 996                         else
 997                                 timeout = 100;
 998                 }
 999                 local->dynamic_ps_user_timeout = timeout;
1000                 if (!local->disable_dynamic_ps)
1001                         conf->dynamic_ps_timeout =
1002                                 local->dynamic_ps_user_timeout;
1003
1004                 if (beaconint_us > latency) {
1005                         local->ps_sdata = NULL;
1006                 } else {
1007                         struct ieee80211_bss *bss;
1008                         int maxslp = 1;
1009                         u8 dtimper;
1010
1011                         bss = (void *)found->u.mgd.associated->priv;
1012                         dtimper = bss->dtim_period;
1013
1014                         /* If the TIM IE is invalid, pretend the value is 1 */
1015                         if (!dtimper)
1016                                 dtimper = 1;
1017                         else if (dtimper > 1)
1018                                 maxslp = min_t(int, dtimper,
1019                                                     latency / beaconint_us);
1020
1021                         local->hw.conf.max_sleep_period = maxslp;
1022                         local->hw.conf.ps_dtim_period = dtimper;
1023                         local->ps_sdata = found;
1024                 }
1025         } else {
1026                 local->ps_sdata = NULL;
1027         }
1028
1029         ieee80211_change_ps(local);
1030 }
1031
1032 void ieee80211_recalc_ps_vif(struct ieee80211_sub_if_data *sdata)
1033 {
1034         bool ps_allowed = ieee80211_powersave_allowed(sdata);
1035
1036         if (sdata->vif.bss_conf.ps != ps_allowed) {
1037                 sdata->vif.bss_conf.ps = ps_allowed;
1038                 ieee80211_bss_info_change_notify(sdata, BSS_CHANGED_PS);
1039         }
1040 }
1041
1042 void ieee80211_dynamic_ps_disable_work(struct work_struct *work)
1043 {
1044         struct ieee80211_local *local =
1045                 container_of(work, struct ieee80211_local,
1046                              dynamic_ps_disable_work);
1047
1048         if (local->hw.conf.flags & IEEE80211_CONF_PS) {
1049                 local->hw.conf.flags &= ~IEEE80211_CONF_PS;
1050                 ieee80211_hw_config(local, IEEE80211_CONF_CHANGE_PS);
1051         }
1052
1053         ieee80211_wake_queues_by_reason(&local->hw,
1054                                         IEEE80211_QUEUE_STOP_REASON_PS);
1055 }
1056
1057 void ieee80211_dynamic_ps_enable_work(struct work_struct *work)
1058 {
1059         struct ieee80211_local *local =
1060                 container_of(work, struct ieee80211_local,
1061                              dynamic_ps_enable_work);
1062         struct ieee80211_sub_if_data *sdata = local->ps_sdata;
1063         struct ieee80211_if_managed *ifmgd;
1064         unsigned long flags;
1065         int q;
1066
1067         /* can only happen when PS was just disabled anyway */
1068         if (!sdata)
1069                 return;
1070
1071         ifmgd = &sdata->u.mgd;
1072
1073         if (local->hw.conf.flags & IEEE80211_CONF_PS)
1074                 return;
1075
1076         if (!local->disable_dynamic_ps &&
1077             local->hw.conf.dynamic_ps_timeout > 0) {
1078                 /* don't enter PS if TX frames are pending */
1079                 if (drv_tx_frames_pending(local)) {
1080                         mod_timer(&local->dynamic_ps_timer, jiffies +
1081                                   msecs_to_jiffies(
1082                                   local->hw.conf.dynamic_ps_timeout));
1083                         return;
1084                 }
1085
1086                 /*
1087                  * transmission can be stopped by others which leads to
1088                  * dynamic_ps_timer expiry. Postpone the ps timer if it
1089                  * is not the actual idle state.
1090                  */
1091                 spin_lock_irqsave(&local->queue_stop_reason_lock, flags);
1092                 for (q = 0; q < local->hw.queues; q++) {
1093                         if (local->queue_stop_reasons[q]) {
1094                                 spin_unlock_irqrestore(&local->queue_stop_reason_lock,
1095                                                        flags);
1096                                 mod_timer(&local->dynamic_ps_timer, jiffies +
1097                                           msecs_to_jiffies(
1098                                           local->hw.conf.dynamic_ps_timeout));
1099                                 return;
1100                         }
1101                 }
1102                 spin_unlock_irqrestore(&local->queue_stop_reason_lock, flags);
1103         }
1104
1105         if ((local->hw.flags & IEEE80211_HW_PS_NULLFUNC_STACK) &&
1106             !(ifmgd->flags & IEEE80211_STA_NULLFUNC_ACKED)) {
1107                 netif_tx_stop_all_queues(sdata->dev);
1108
1109                 if (drv_tx_frames_pending(local))
1110                         mod_timer(&local->dynamic_ps_timer, jiffies +
1111                                   msecs_to_jiffies(
1112                                   local->hw.conf.dynamic_ps_timeout));
1113                 else {
1114                         ieee80211_send_nullfunc(local, sdata, 1);
1115                         /* Flush to get the tx status of nullfunc frame */
1116                         drv_flush(local, false);
1117                 }
1118         }
1119
1120         if (!((local->hw.flags & IEEE80211_HW_REPORTS_TX_ACK_STATUS) &&
1121               (local->hw.flags & IEEE80211_HW_PS_NULLFUNC_STACK)) ||
1122             (ifmgd->flags & IEEE80211_STA_NULLFUNC_ACKED)) {
1123                 ifmgd->flags &= ~IEEE80211_STA_NULLFUNC_ACKED;
1124                 local->hw.conf.flags |= IEEE80211_CONF_PS;
1125                 ieee80211_hw_config(local, IEEE80211_CONF_CHANGE_PS);
1126         }
1127
1128         if (local->hw.flags & IEEE80211_HW_PS_NULLFUNC_STACK)
1129                 netif_tx_wake_all_queues(sdata->dev);
1130 }
1131
1132 void ieee80211_dynamic_ps_timer(unsigned long data)
1133 {
1134         struct ieee80211_local *local = (void *) data;
1135
1136         if (local->quiescing || local->suspended)
1137                 return;
1138
1139         ieee80211_queue_work(&local->hw, &local->dynamic_ps_enable_work);
1140 }
1141
1142 /* MLME */
1143 static bool ieee80211_sta_wmm_params(struct ieee80211_local *local,
1144                                      struct ieee80211_sub_if_data *sdata,
1145                                      u8 *wmm_param, size_t wmm_param_len)
1146 {
1147         struct ieee80211_tx_queue_params params;
1148         struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
1149         size_t left;
1150         int count;
1151         u8 *pos, uapsd_queues = 0;
1152
1153         if (!local->ops->conf_tx)
1154                 return false;
1155
1156         if (local->hw.queues < IEEE80211_NUM_ACS)
1157                 return false;
1158
1159         if (!wmm_param)
1160                 return false;
1161
1162         if (wmm_param_len < 8 || wmm_param[5] /* version */ != 1)
1163                 return false;
1164
1165         if (ifmgd->flags & IEEE80211_STA_UAPSD_ENABLED)
1166                 uapsd_queues = ifmgd->uapsd_queues;
1167
1168         count = wmm_param[6] & 0x0f;
1169         if (count == ifmgd->wmm_last_param_set)
1170                 return false;
1171         ifmgd->wmm_last_param_set = count;
1172
1173         pos = wmm_param + 8;
1174         left = wmm_param_len - 8;
1175
1176         memset(&params, 0, sizeof(params));
1177
1178         sdata->wmm_acm = 0;
1179         for (; left >= 4; left -= 4, pos += 4) {
1180                 int aci = (pos[0] >> 5) & 0x03;
1181                 int acm = (pos[0] >> 4) & 0x01;
1182                 bool uapsd = false;
1183                 int queue;
1184
1185                 switch (aci) {
1186                 case 1: /* AC_BK */
1187                         queue = 3;
1188                         if (acm)
1189                                 sdata->wmm_acm |= BIT(1) | BIT(2); /* BK/- */
1190                         if (uapsd_queues & IEEE80211_WMM_IE_STA_QOSINFO_AC_BK)
1191                                 uapsd = true;
1192                         break;
1193                 case 2: /* AC_VI */
1194                         queue = 1;
1195                         if (acm)
1196                                 sdata->wmm_acm |= BIT(4) | BIT(5); /* CL/VI */
1197                         if (uapsd_queues & IEEE80211_WMM_IE_STA_QOSINFO_AC_VI)
1198                                 uapsd = true;
1199                         break;
1200                 case 3: /* AC_VO */
1201                         queue = 0;
1202                         if (acm)
1203                                 sdata->wmm_acm |= BIT(6) | BIT(7); /* VO/NC */
1204                         if (uapsd_queues & IEEE80211_WMM_IE_STA_QOSINFO_AC_VO)
1205                                 uapsd = true;
1206                         break;
1207                 case 0: /* AC_BE */
1208                 default:
1209                         queue = 2;
1210                         if (acm)
1211                                 sdata->wmm_acm |= BIT(0) | BIT(3); /* BE/EE */
1212                         if (uapsd_queues & IEEE80211_WMM_IE_STA_QOSINFO_AC_BE)
1213                                 uapsd = true;
1214                         break;
1215                 }
1216
1217                 params.aifs = pos[0] & 0x0f;
1218                 params.cw_max = ecw2cw((pos[1] & 0xf0) >> 4);
1219                 params.cw_min = ecw2cw(pos[1] & 0x0f);
1220                 params.txop = get_unaligned_le16(pos + 2);
1221                 params.uapsd = uapsd;
1222
1223                 mlme_dbg(sdata,
1224                          "WMM queue=%d aci=%d acm=%d aifs=%d cWmin=%d cWmax=%d txop=%d uapsd=%d\n",
1225                          queue, aci, acm,
1226                          params.aifs, params.cw_min, params.cw_max,
1227                          params.txop, params.uapsd);
1228                 sdata->tx_conf[queue] = params;
1229                 if (drv_conf_tx(local, sdata, queue, &params))
1230                         sdata_err(sdata,
1231                                   "failed to set TX queue parameters for queue %d\n",
1232                                   queue);
1233         }
1234
1235         /* enable WMM or activate new settings */
1236         sdata->vif.bss_conf.qos = true;
1237         return true;
1238 }
1239
1240 static void __ieee80211_stop_poll(struct ieee80211_sub_if_data *sdata)
1241 {
1242         lockdep_assert_held(&sdata->local->mtx);
1243
1244         sdata->u.mgd.flags &= ~(IEEE80211_STA_CONNECTION_POLL |
1245                                 IEEE80211_STA_BEACON_POLL);
1246         ieee80211_run_deferred_scan(sdata->local);
1247 }
1248
1249 static void ieee80211_stop_poll(struct ieee80211_sub_if_data *sdata)
1250 {
1251         mutex_lock(&sdata->local->mtx);
1252         __ieee80211_stop_poll(sdata);
1253         mutex_unlock(&sdata->local->mtx);
1254 }
1255
1256 static u32 ieee80211_handle_bss_capability(struct ieee80211_sub_if_data *sdata,
1257                                            u16 capab, bool erp_valid, u8 erp)
1258 {
1259         struct ieee80211_bss_conf *bss_conf = &sdata->vif.bss_conf;
1260         u32 changed = 0;
1261         bool use_protection;
1262         bool use_short_preamble;
1263         bool use_short_slot;
1264
1265         if (erp_valid) {
1266                 use_protection = (erp & WLAN_ERP_USE_PROTECTION) != 0;
1267                 use_short_preamble = (erp & WLAN_ERP_BARKER_PREAMBLE) == 0;
1268         } else {
1269                 use_protection = false;
1270                 use_short_preamble = !!(capab & WLAN_CAPABILITY_SHORT_PREAMBLE);
1271         }
1272
1273         use_short_slot = !!(capab & WLAN_CAPABILITY_SHORT_SLOT_TIME);
1274         if (sdata->local->oper_channel->band == IEEE80211_BAND_5GHZ)
1275                 use_short_slot = true;
1276
1277         if (use_protection != bss_conf->use_cts_prot) {
1278                 bss_conf->use_cts_prot = use_protection;
1279                 changed |= BSS_CHANGED_ERP_CTS_PROT;
1280         }
1281
1282         if (use_short_preamble != bss_conf->use_short_preamble) {
1283                 bss_conf->use_short_preamble = use_short_preamble;
1284                 changed |= BSS_CHANGED_ERP_PREAMBLE;
1285         }
1286
1287         if (use_short_slot != bss_conf->use_short_slot) {
1288                 bss_conf->use_short_slot = use_short_slot;
1289                 changed |= BSS_CHANGED_ERP_SLOT;
1290         }
1291
1292         return changed;
1293 }
1294
1295 static void ieee80211_set_associated(struct ieee80211_sub_if_data *sdata,
1296                                      struct cfg80211_bss *cbss,
1297                                      u32 bss_info_changed)
1298 {
1299         struct ieee80211_bss *bss = (void *)cbss->priv;
1300         struct ieee80211_local *local = sdata->local;
1301         struct ieee80211_bss_conf *bss_conf = &sdata->vif.bss_conf;
1302
1303         bss_info_changed |= BSS_CHANGED_ASSOC;
1304         bss_info_changed |= ieee80211_handle_bss_capability(sdata,
1305                 bss_conf->assoc_capability, bss->has_erp_value, bss->erp_value);
1306
1307         sdata->u.mgd.beacon_timeout = usecs_to_jiffies(ieee80211_tu_to_usec(
1308                 IEEE80211_BEACON_LOSS_COUNT * bss_conf->beacon_int));
1309
1310         sdata->u.mgd.associated = cbss;
1311         memcpy(sdata->u.mgd.bssid, cbss->bssid, ETH_ALEN);
1312
1313         sdata->u.mgd.flags |= IEEE80211_STA_RESET_SIGNAL_AVE;
1314
1315         /* just to be sure */
1316         ieee80211_stop_poll(sdata);
1317
1318         ieee80211_led_assoc(local, 1);
1319
1320         if (local->hw.flags & IEEE80211_HW_NEED_DTIM_PERIOD)
1321                 bss_conf->dtim_period = bss->dtim_period;
1322         else
1323                 bss_conf->dtim_period = 0;
1324
1325         bss_conf->assoc = 1;
1326
1327         /* Tell the driver to monitor connection quality (if supported) */
1328         if (sdata->vif.driver_flags & IEEE80211_VIF_SUPPORTS_CQM_RSSI &&
1329             bss_conf->cqm_rssi_thold)
1330                 bss_info_changed |= BSS_CHANGED_CQM;
1331
1332         /* Enable ARP filtering */
1333         if (bss_conf->arp_filter_enabled != sdata->arp_filter_state) {
1334                 bss_conf->arp_filter_enabled = sdata->arp_filter_state;
1335                 bss_info_changed |= BSS_CHANGED_ARP_FILTER;
1336         }
1337
1338         ieee80211_bss_info_change_notify(sdata, bss_info_changed);
1339
1340         mutex_lock(&local->iflist_mtx);
1341         ieee80211_recalc_ps(local, -1);
1342         ieee80211_recalc_smps(local);
1343         mutex_unlock(&local->iflist_mtx);
1344
1345         ieee80211_recalc_ps_vif(sdata);
1346
1347         netif_tx_start_all_queues(sdata->dev);
1348         netif_carrier_on(sdata->dev);
1349 }
1350
1351 static void ieee80211_set_disassoc(struct ieee80211_sub_if_data *sdata,
1352                                    u16 stype, u16 reason, bool tx,
1353                                    u8 *frame_buf)
1354 {
1355         struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
1356         struct ieee80211_local *local = sdata->local;
1357         struct sta_info *sta;
1358         u32 changed = 0;
1359
1360         ASSERT_MGD_MTX(ifmgd);
1361
1362         if (WARN_ON_ONCE(tx && !frame_buf))
1363                 return;
1364
1365         if (WARN_ON(!ifmgd->associated))
1366                 return;
1367
1368         ieee80211_stop_poll(sdata);
1369
1370         ifmgd->associated = NULL;
1371
1372         /*
1373          * we need to commit the associated = NULL change because the
1374          * scan code uses that to determine whether this iface should
1375          * go to/wake up from powersave or not -- and could otherwise
1376          * wake the queues erroneously.
1377          */
1378         smp_mb();
1379
1380         /*
1381          * Thus, we can only afterwards stop the queues -- to account
1382          * for the case where another CPU is finishing a scan at this
1383          * time -- we don't want the scan code to enable queues.
1384          */
1385
1386         netif_tx_stop_all_queues(sdata->dev);
1387         netif_carrier_off(sdata->dev);
1388
1389         mutex_lock(&local->sta_mtx);
1390         sta = sta_info_get(sdata, ifmgd->bssid);
1391         if (sta) {
1392                 set_sta_flag(sta, WLAN_STA_BLOCK_BA);
1393                 ieee80211_sta_tear_down_BA_sessions(sta, tx);
1394         }
1395         mutex_unlock(&local->sta_mtx);
1396
1397         /*
1398          * if we want to get out of ps before disassoc (why?) we have
1399          * to do it before sending disassoc, as otherwise the null-packet
1400          * won't be valid.
1401          */
1402         if (local->hw.conf.flags & IEEE80211_CONF_PS) {
1403                 local->hw.conf.flags &= ~IEEE80211_CONF_PS;
1404                 ieee80211_hw_config(local, IEEE80211_CONF_CHANGE_PS);
1405         }
1406         local->ps_sdata = NULL;
1407
1408         /* disable per-vif ps */
1409         ieee80211_recalc_ps_vif(sdata);
1410
1411         /* flush out any pending frame (e.g. DELBA) before deauth/disassoc */
1412         if (tx)
1413                 drv_flush(local, false);
1414
1415         /* deauthenticate/disassociate now */
1416         if (tx || frame_buf)
1417                 ieee80211_send_deauth_disassoc(sdata, ifmgd->bssid, stype,
1418                                                reason, tx, frame_buf);
1419
1420         /* flush out frame */
1421         if (tx)
1422                 drv_flush(local, false);
1423
1424         /* clear bssid only after building the needed mgmt frames */
1425         memset(ifmgd->bssid, 0, ETH_ALEN);
1426
1427         /* remove AP and TDLS peers */
1428         sta_info_flush(local, sdata);
1429
1430         /* finally reset all BSS / config parameters */
1431         changed |= ieee80211_reset_erp_info(sdata);
1432
1433         ieee80211_led_assoc(local, 0);
1434         changed |= BSS_CHANGED_ASSOC;
1435         sdata->vif.bss_conf.assoc = false;
1436
1437         /* on the next assoc, re-program HT parameters */
1438         memset(&ifmgd->ht_capa, 0, sizeof(ifmgd->ht_capa));
1439         memset(&ifmgd->ht_capa_mask, 0, sizeof(ifmgd->ht_capa_mask));
1440
1441         local->power_constr_level = 0;
1442
1443         del_timer_sync(&local->dynamic_ps_timer);
1444         cancel_work_sync(&local->dynamic_ps_enable_work);
1445
1446         /* Disable ARP filtering */
1447         if (sdata->vif.bss_conf.arp_filter_enabled) {
1448                 sdata->vif.bss_conf.arp_filter_enabled = false;
1449                 changed |= BSS_CHANGED_ARP_FILTER;
1450         }
1451
1452         sdata->vif.bss_conf.qos = false;
1453         changed |= BSS_CHANGED_QOS;
1454
1455         /* The BSSID (not really interesting) and HT changed */
1456         changed |= BSS_CHANGED_BSSID | BSS_CHANGED_HT;
1457         ieee80211_bss_info_change_notify(sdata, changed);
1458
1459         /* channel(_type) changes are handled by ieee80211_hw_config */
1460         WARN_ON(!ieee80211_set_channel_type(local, sdata, NL80211_CHAN_NO_HT));
1461         ieee80211_hw_config(local, 0);
1462
1463         /* disassociated - set to defaults now */
1464         ieee80211_set_wmm_default(sdata, false);
1465
1466         del_timer_sync(&sdata->u.mgd.conn_mon_timer);
1467         del_timer_sync(&sdata->u.mgd.bcn_mon_timer);
1468         del_timer_sync(&sdata->u.mgd.timer);
1469         del_timer_sync(&sdata->u.mgd.chswitch_timer);
1470 }
1471
1472 void ieee80211_sta_rx_notify(struct ieee80211_sub_if_data *sdata,
1473                              struct ieee80211_hdr *hdr)
1474 {
1475         /*
1476          * We can postpone the mgd.timer whenever receiving unicast frames
1477          * from AP because we know that the connection is working both ways
1478          * at that time. But multicast frames (and hence also beacons) must
1479          * be ignored here, because we need to trigger the timer during
1480          * data idle periods for sending the periodic probe request to the
1481          * AP we're connected to.
1482          */
1483         if (is_multicast_ether_addr(hdr->addr1))
1484                 return;
1485
1486         ieee80211_sta_reset_conn_monitor(sdata);
1487 }
1488
1489 static void ieee80211_reset_ap_probe(struct ieee80211_sub_if_data *sdata)
1490 {
1491         struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
1492         struct ieee80211_local *local = sdata->local;
1493
1494         mutex_lock(&local->mtx);
1495         if (!(ifmgd->flags & (IEEE80211_STA_BEACON_POLL |
1496                               IEEE80211_STA_CONNECTION_POLL))) {
1497                 mutex_unlock(&local->mtx);
1498                 return;
1499         }
1500
1501         __ieee80211_stop_poll(sdata);
1502
1503         mutex_lock(&local->iflist_mtx);
1504         ieee80211_recalc_ps(local, -1);
1505         mutex_unlock(&local->iflist_mtx);
1506
1507         if (sdata->local->hw.flags & IEEE80211_HW_CONNECTION_MONITOR)
1508                 goto out;
1509
1510         /*
1511          * We've received a probe response, but are not sure whether
1512          * we have or will be receiving any beacons or data, so let's
1513          * schedule the timers again, just in case.
1514          */
1515         ieee80211_sta_reset_beacon_monitor(sdata);
1516
1517         mod_timer(&ifmgd->conn_mon_timer,
1518                   round_jiffies_up(jiffies +
1519                                    IEEE80211_CONNECTION_IDLE_TIME));
1520 out:
1521         mutex_unlock(&local->mtx);
1522 }
1523
1524 void ieee80211_sta_tx_notify(struct ieee80211_sub_if_data *sdata,
1525                              struct ieee80211_hdr *hdr, bool ack)
1526 {
1527         if (!ieee80211_is_data(hdr->frame_control))
1528             return;
1529
1530         if (ack)
1531                 ieee80211_sta_reset_conn_monitor(sdata);
1532
1533         if (ieee80211_is_nullfunc(hdr->frame_control) &&
1534             sdata->u.mgd.probe_send_count > 0) {
1535                 if (ack)
1536                         sdata->u.mgd.probe_send_count = 0;
1537                 else
1538                         sdata->u.mgd.nullfunc_failed = true;
1539                 ieee80211_queue_work(&sdata->local->hw, &sdata->work);
1540         }
1541 }
1542
1543 static void ieee80211_mgd_probe_ap_send(struct ieee80211_sub_if_data *sdata)
1544 {
1545         struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
1546         const u8 *ssid;
1547         u8 *dst = ifmgd->associated->bssid;
1548         u8 unicast_limit = max(1, max_probe_tries - 3);
1549
1550         /*
1551          * Try sending broadcast probe requests for the last three
1552          * probe requests after the first ones failed since some
1553          * buggy APs only support broadcast probe requests.
1554          */
1555         if (ifmgd->probe_send_count >= unicast_limit)
1556                 dst = NULL;
1557
1558         /*
1559          * When the hardware reports an accurate Tx ACK status, it's
1560          * better to send a nullfunc frame instead of a probe request,
1561          * as it will kick us off the AP quickly if we aren't associated
1562          * anymore. The timeout will be reset if the frame is ACKed by
1563          * the AP.
1564          */
1565         ifmgd->probe_send_count++;
1566
1567         if (sdata->local->hw.flags & IEEE80211_HW_REPORTS_TX_ACK_STATUS) {
1568                 ifmgd->nullfunc_failed = false;
1569                 ieee80211_send_nullfunc(sdata->local, sdata, 0);
1570         } else {
1571                 int ssid_len;
1572
1573                 ssid = ieee80211_bss_get_ie(ifmgd->associated, WLAN_EID_SSID);
1574                 if (WARN_ON_ONCE(ssid == NULL))
1575                         ssid_len = 0;
1576                 else
1577                         ssid_len = ssid[1];
1578
1579                 ieee80211_send_probe_req(sdata, dst, ssid + 2, ssid_len, NULL,
1580                                          0, (u32) -1, true, false);
1581         }
1582
1583         ifmgd->probe_timeout = jiffies + msecs_to_jiffies(probe_wait_ms);
1584         run_again(ifmgd, ifmgd->probe_timeout);
1585         if (sdata->local->hw.flags & IEEE80211_HW_REPORTS_TX_ACK_STATUS)
1586                 drv_flush(sdata->local, false);
1587 }
1588
1589 static void ieee80211_mgd_probe_ap(struct ieee80211_sub_if_data *sdata,
1590                                    bool beacon)
1591 {
1592         struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
1593         bool already = false;
1594
1595         if (!ieee80211_sdata_running(sdata))
1596                 return;
1597
1598         mutex_lock(&ifmgd->mtx);
1599
1600         if (!ifmgd->associated)
1601                 goto out;
1602
1603         mutex_lock(&sdata->local->mtx);
1604
1605         if (sdata->local->tmp_channel || sdata->local->scanning) {
1606                 mutex_unlock(&sdata->local->mtx);
1607                 goto out;
1608         }
1609
1610         if (beacon)
1611                 mlme_dbg_ratelimited(sdata,
1612                                      "detected beacon loss from AP - sending probe request\n");
1613
1614         ieee80211_cqm_rssi_notify(&sdata->vif,
1615                 NL80211_CQM_RSSI_BEACON_LOSS_EVENT, GFP_KERNEL);
1616
1617         /*
1618          * The driver/our work has already reported this event or the
1619          * connection monitoring has kicked in and we have already sent
1620          * a probe request. Or maybe the AP died and the driver keeps
1621          * reporting until we disassociate...
1622          *
1623          * In either case we have to ignore the current call to this
1624          * function (except for setting the correct probe reason bit)
1625          * because otherwise we would reset the timer every time and
1626          * never check whether we received a probe response!
1627          */
1628         if (ifmgd->flags & (IEEE80211_STA_BEACON_POLL |
1629                             IEEE80211_STA_CONNECTION_POLL))
1630                 already = true;
1631
1632         if (beacon)
1633                 ifmgd->flags |= IEEE80211_STA_BEACON_POLL;
1634         else
1635                 ifmgd->flags |= IEEE80211_STA_CONNECTION_POLL;
1636
1637         mutex_unlock(&sdata->local->mtx);
1638
1639         if (already)
1640                 goto out;
1641
1642         mutex_lock(&sdata->local->iflist_mtx);
1643         ieee80211_recalc_ps(sdata->local, -1);
1644         mutex_unlock(&sdata->local->iflist_mtx);
1645
1646         ifmgd->probe_send_count = 0;
1647         ieee80211_mgd_probe_ap_send(sdata);
1648  out:
1649         mutex_unlock(&ifmgd->mtx);
1650 }
1651
1652 struct sk_buff *ieee80211_ap_probereq_get(struct ieee80211_hw *hw,
1653                                           struct ieee80211_vif *vif)
1654 {
1655         struct ieee80211_sub_if_data *sdata = vif_to_sdata(vif);
1656         struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
1657         struct cfg80211_bss *cbss;
1658         struct sk_buff *skb;
1659         const u8 *ssid;
1660         int ssid_len;
1661
1662         if (WARN_ON(sdata->vif.type != NL80211_IFTYPE_STATION))
1663                 return NULL;
1664
1665         ASSERT_MGD_MTX(ifmgd);
1666
1667         if (ifmgd->associated)
1668                 cbss = ifmgd->associated;
1669         else if (ifmgd->auth_data)
1670                 cbss = ifmgd->auth_data->bss;
1671         else if (ifmgd->assoc_data)
1672                 cbss = ifmgd->assoc_data->bss;
1673         else
1674                 return NULL;
1675
1676         ssid = ieee80211_bss_get_ie(cbss, WLAN_EID_SSID);
1677         if (WARN_ON_ONCE(ssid == NULL))
1678                 ssid_len = 0;
1679         else
1680                 ssid_len = ssid[1];
1681
1682         skb = ieee80211_build_probe_req(sdata, cbss->bssid,
1683                                         (u32) -1,
1684                                         sdata->local->oper_channel,
1685                                         ssid + 2, ssid_len,
1686                                         NULL, 0, true);
1687
1688         return skb;
1689 }
1690 EXPORT_SYMBOL(ieee80211_ap_probereq_get);
1691
1692 static void __ieee80211_connection_loss(struct ieee80211_sub_if_data *sdata)
1693 {
1694         struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
1695         struct ieee80211_local *local = sdata->local;
1696         u8 frame_buf[DEAUTH_DISASSOC_LEN];
1697
1698         mutex_lock(&ifmgd->mtx);
1699         if (!ifmgd->associated) {
1700                 mutex_unlock(&ifmgd->mtx);
1701                 return;
1702         }
1703
1704         sdata_info(sdata, "Connection to AP %pM lost\n",
1705                    ifmgd->associated->bssid);
1706
1707         ieee80211_set_disassoc(sdata, IEEE80211_STYPE_DEAUTH,
1708                                WLAN_REASON_DISASSOC_DUE_TO_INACTIVITY,
1709                                false, frame_buf);
1710         mutex_unlock(&ifmgd->mtx);
1711
1712         /*
1713          * must be outside lock due to cfg80211,
1714          * but that's not a problem.
1715          */
1716         cfg80211_send_deauth(sdata->dev, frame_buf, DEAUTH_DISASSOC_LEN);
1717
1718         mutex_lock(&local->mtx);
1719         ieee80211_recalc_idle(local);
1720         mutex_unlock(&local->mtx);
1721 }
1722
1723 void ieee80211_beacon_connection_loss_work(struct work_struct *work)
1724 {
1725         struct ieee80211_sub_if_data *sdata =
1726                 container_of(work, struct ieee80211_sub_if_data,
1727                              u.mgd.beacon_connection_loss_work);
1728         struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
1729         struct sta_info *sta;
1730
1731         if (ifmgd->associated) {
1732                 rcu_read_lock();
1733                 sta = sta_info_get(sdata, ifmgd->bssid);
1734                 if (sta)
1735                         sta->beacon_loss_count++;
1736                 rcu_read_unlock();
1737         }
1738
1739         if (sdata->local->hw.flags & IEEE80211_HW_CONNECTION_MONITOR)
1740                 __ieee80211_connection_loss(sdata);
1741         else
1742                 ieee80211_mgd_probe_ap(sdata, true);
1743 }
1744
1745 void ieee80211_beacon_loss(struct ieee80211_vif *vif)
1746 {
1747         struct ieee80211_sub_if_data *sdata = vif_to_sdata(vif);
1748         struct ieee80211_hw *hw = &sdata->local->hw;
1749
1750         trace_api_beacon_loss(sdata);
1751
1752         WARN_ON(hw->flags & IEEE80211_HW_CONNECTION_MONITOR);
1753         ieee80211_queue_work(hw, &sdata->u.mgd.beacon_connection_loss_work);
1754 }
1755 EXPORT_SYMBOL(ieee80211_beacon_loss);
1756
1757 void ieee80211_connection_loss(struct ieee80211_vif *vif)
1758 {
1759         struct ieee80211_sub_if_data *sdata = vif_to_sdata(vif);
1760         struct ieee80211_hw *hw = &sdata->local->hw;
1761
1762         trace_api_connection_loss(sdata);
1763
1764         WARN_ON(!(hw->flags & IEEE80211_HW_CONNECTION_MONITOR));
1765         ieee80211_queue_work(hw, &sdata->u.mgd.beacon_connection_loss_work);
1766 }
1767 EXPORT_SYMBOL(ieee80211_connection_loss);
1768
1769
1770 static void ieee80211_destroy_auth_data(struct ieee80211_sub_if_data *sdata,
1771                                         bool assoc)
1772 {
1773         struct ieee80211_mgd_auth_data *auth_data = sdata->u.mgd.auth_data;
1774
1775         lockdep_assert_held(&sdata->u.mgd.mtx);
1776
1777         if (!assoc) {
1778                 sta_info_destroy_addr(sdata, auth_data->bss->bssid);
1779
1780                 memset(sdata->u.mgd.bssid, 0, ETH_ALEN);
1781                 ieee80211_bss_info_change_notify(sdata, BSS_CHANGED_BSSID);
1782         }
1783
1784         cfg80211_put_bss(auth_data->bss);
1785         kfree(auth_data);
1786         sdata->u.mgd.auth_data = NULL;
1787 }
1788
1789 static void ieee80211_auth_challenge(struct ieee80211_sub_if_data *sdata,
1790                                      struct ieee80211_mgmt *mgmt, size_t len)
1791 {
1792         struct ieee80211_mgd_auth_data *auth_data = sdata->u.mgd.auth_data;
1793         u8 *pos;
1794         struct ieee802_11_elems elems;
1795
1796         pos = mgmt->u.auth.variable;
1797         ieee802_11_parse_elems(pos, len - (pos - (u8 *) mgmt), &elems);
1798         if (!elems.challenge)
1799                 return;
1800         auth_data->expected_transaction = 4;
1801         drv_mgd_prepare_tx(sdata->local, sdata);
1802         ieee80211_send_auth(sdata, 3, auth_data->algorithm,
1803                             elems.challenge - 2, elems.challenge_len + 2,
1804                             auth_data->bss->bssid, auth_data->bss->bssid,
1805                             auth_data->key, auth_data->key_len,
1806                             auth_data->key_idx);
1807 }
1808
1809 static enum rx_mgmt_action __must_check
1810 ieee80211_rx_mgmt_auth(struct ieee80211_sub_if_data *sdata,
1811                        struct ieee80211_mgmt *mgmt, size_t len)
1812 {
1813         struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
1814         u8 bssid[ETH_ALEN];
1815         u16 auth_alg, auth_transaction, status_code;
1816         struct sta_info *sta;
1817
1818         lockdep_assert_held(&ifmgd->mtx);
1819
1820         if (len < 24 + 6)
1821                 return RX_MGMT_NONE;
1822
1823         if (!ifmgd->auth_data || ifmgd->auth_data->done)
1824                 return RX_MGMT_NONE;
1825
1826         memcpy(bssid, ifmgd->auth_data->bss->bssid, ETH_ALEN);
1827
1828         if (!ether_addr_equal(bssid, mgmt->bssid))
1829                 return RX_MGMT_NONE;
1830
1831         auth_alg = le16_to_cpu(mgmt->u.auth.auth_alg);
1832         auth_transaction = le16_to_cpu(mgmt->u.auth.auth_transaction);
1833         status_code = le16_to_cpu(mgmt->u.auth.status_code);
1834
1835         if (auth_alg != ifmgd->auth_data->algorithm ||
1836             auth_transaction != ifmgd->auth_data->expected_transaction)
1837                 return RX_MGMT_NONE;
1838
1839         if (status_code != WLAN_STATUS_SUCCESS) {
1840                 sdata_info(sdata, "%pM denied authentication (status %d)\n",
1841                            mgmt->sa, status_code);
1842                 ieee80211_destroy_auth_data(sdata, false);
1843                 return RX_MGMT_CFG80211_RX_AUTH;
1844         }
1845
1846         switch (ifmgd->auth_data->algorithm) {
1847         case WLAN_AUTH_OPEN:
1848         case WLAN_AUTH_LEAP:
1849         case WLAN_AUTH_FT:
1850                 break;
1851         case WLAN_AUTH_SHARED_KEY:
1852                 if (ifmgd->auth_data->expected_transaction != 4) {
1853                         ieee80211_auth_challenge(sdata, mgmt, len);
1854                         /* need another frame */
1855                         return RX_MGMT_NONE;
1856                 }
1857                 break;
1858         default:
1859                 WARN_ONCE(1, "invalid auth alg %d",
1860                           ifmgd->auth_data->algorithm);
1861                 return RX_MGMT_NONE;
1862         }
1863
1864         sdata_info(sdata, "authenticated\n");
1865         ifmgd->auth_data->done = true;
1866         ifmgd->auth_data->timeout = jiffies + IEEE80211_AUTH_WAIT_ASSOC;
1867         run_again(ifmgd, ifmgd->auth_data->timeout);
1868
1869         /* move station state to auth */
1870         mutex_lock(&sdata->local->sta_mtx);
1871         sta = sta_info_get(sdata, bssid);
1872         if (!sta) {
1873                 WARN_ONCE(1, "%s: STA %pM not found", sdata->name, bssid);
1874                 goto out_err;
1875         }
1876         if (sta_info_move_state(sta, IEEE80211_STA_AUTH)) {
1877                 sdata_info(sdata, "failed moving %pM to auth\n", bssid);
1878                 goto out_err;
1879         }
1880         mutex_unlock(&sdata->local->sta_mtx);
1881
1882         return RX_MGMT_CFG80211_RX_AUTH;
1883  out_err:
1884         mutex_unlock(&sdata->local->sta_mtx);
1885         /* ignore frame -- wait for timeout */
1886         return RX_MGMT_NONE;
1887 }
1888
1889
1890 static enum rx_mgmt_action __must_check
1891 ieee80211_rx_mgmt_deauth(struct ieee80211_sub_if_data *sdata,
1892                          struct ieee80211_mgmt *mgmt, size_t len)
1893 {
1894         struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
1895         const u8 *bssid = NULL;
1896         u16 reason_code;
1897
1898         lockdep_assert_held(&ifmgd->mtx);
1899
1900         if (len < 24 + 2)
1901                 return RX_MGMT_NONE;
1902
1903         if (!ifmgd->associated ||
1904             !ether_addr_equal(mgmt->bssid, ifmgd->associated->bssid))
1905                 return RX_MGMT_NONE;
1906
1907         bssid = ifmgd->associated->bssid;
1908
1909         reason_code = le16_to_cpu(mgmt->u.deauth.reason_code);
1910
1911         sdata_info(sdata, "deauthenticated from %pM (Reason: %u)\n",
1912                    bssid, reason_code);
1913
1914         ieee80211_set_disassoc(sdata, 0, 0, false, NULL);
1915
1916         mutex_lock(&sdata->local->mtx);
1917         ieee80211_recalc_idle(sdata->local);
1918         mutex_unlock(&sdata->local->mtx);
1919
1920         return RX_MGMT_CFG80211_DEAUTH;
1921 }
1922
1923
1924 static enum rx_mgmt_action __must_check
1925 ieee80211_rx_mgmt_disassoc(struct ieee80211_sub_if_data *sdata,
1926                            struct ieee80211_mgmt *mgmt, size_t len)
1927 {
1928         struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
1929         u16 reason_code;
1930
1931         lockdep_assert_held(&ifmgd->mtx);
1932
1933         if (len < 24 + 2)
1934                 return RX_MGMT_NONE;
1935
1936         if (!ifmgd->associated ||
1937             !ether_addr_equal(mgmt->bssid, ifmgd->associated->bssid))
1938                 return RX_MGMT_NONE;
1939
1940         reason_code = le16_to_cpu(mgmt->u.disassoc.reason_code);
1941
1942         sdata_info(sdata, "disassociated from %pM (Reason: %u)\n",
1943                    mgmt->sa, reason_code);
1944
1945         ieee80211_set_disassoc(sdata, 0, 0, false, NULL);
1946
1947         mutex_lock(&sdata->local->mtx);
1948         ieee80211_recalc_idle(sdata->local);
1949         mutex_unlock(&sdata->local->mtx);
1950
1951         return RX_MGMT_CFG80211_DISASSOC;
1952 }
1953
1954 static void ieee80211_get_rates(struct ieee80211_supported_band *sband,
1955                                 u8 *supp_rates, unsigned int supp_rates_len,
1956                                 u32 *rates, u32 *basic_rates,
1957                                 bool *have_higher_than_11mbit,
1958                                 int *min_rate, int *min_rate_index)
1959 {
1960         int i, j;
1961
1962         for (i = 0; i < supp_rates_len; i++) {
1963                 int rate = (supp_rates[i] & 0x7f) * 5;
1964                 bool is_basic = !!(supp_rates[i] & 0x80);
1965
1966                 if (rate > 110)
1967                         *have_higher_than_11mbit = true;
1968
1969                 /*
1970                  * BSS_MEMBERSHIP_SELECTOR_HT_PHY is defined in 802.11n-2009
1971                  * 7.3.2.2 as a magic value instead of a rate. Hence, skip it.
1972                  *
1973                  * Note: Even through the membership selector and the basic
1974                  *       rate flag share the same bit, they are not exactly
1975                  *       the same.
1976                  */
1977                 if (!!(supp_rates[i] & 0x80) &&
1978                     (supp_rates[i] & 0x7f) == BSS_MEMBERSHIP_SELECTOR_HT_PHY)
1979                         continue;
1980
1981                 for (j = 0; j < sband->n_bitrates; j++) {
1982                         if (sband->bitrates[j].bitrate == rate) {
1983                                 *rates |= BIT(j);
1984                                 if (is_basic)
1985                                         *basic_rates |= BIT(j);
1986                                 if (rate < *min_rate) {
1987                                         *min_rate = rate;
1988                                         *min_rate_index = j;
1989                                 }
1990                                 break;
1991                         }
1992                 }
1993         }
1994 }
1995
1996 static void ieee80211_destroy_assoc_data(struct ieee80211_sub_if_data *sdata,
1997                                          bool assoc)
1998 {
1999         struct ieee80211_mgd_assoc_data *assoc_data = sdata->u.mgd.assoc_data;
2000
2001         lockdep_assert_held(&sdata->u.mgd.mtx);
2002
2003         if (!assoc) {
2004                 sta_info_destroy_addr(sdata, assoc_data->bss->bssid);
2005
2006                 memset(sdata->u.mgd.bssid, 0, ETH_ALEN);
2007                 ieee80211_bss_info_change_notify(sdata, BSS_CHANGED_BSSID);
2008         }
2009
2010         kfree(assoc_data);
2011         sdata->u.mgd.assoc_data = NULL;
2012 }
2013
2014 static bool ieee80211_assoc_success(struct ieee80211_sub_if_data *sdata,
2015                                     struct cfg80211_bss *cbss,
2016                                     struct ieee80211_mgmt *mgmt, size_t len)
2017 {
2018         struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
2019         struct ieee80211_local *local = sdata->local;
2020         struct ieee80211_supported_band *sband;
2021         struct sta_info *sta;
2022         u8 *pos;
2023         u16 capab_info, aid;
2024         struct ieee802_11_elems elems;
2025         struct ieee80211_bss_conf *bss_conf = &sdata->vif.bss_conf;
2026         u32 changed = 0;
2027         int err;
2028
2029         /* AssocResp and ReassocResp have identical structure */
2030
2031         aid = le16_to_cpu(mgmt->u.assoc_resp.aid);
2032         capab_info = le16_to_cpu(mgmt->u.assoc_resp.capab_info);
2033
2034         if ((aid & (BIT(15) | BIT(14))) != (BIT(15) | BIT(14)))
2035                 sdata_info(sdata, "invalid AID value 0x%x; bits 15:14 not set\n",
2036                            aid);
2037         aid &= ~(BIT(15) | BIT(14));
2038
2039         ifmgd->broken_ap = false;
2040
2041         if (aid == 0 || aid > IEEE80211_MAX_AID) {
2042                 sdata_info(sdata, "invalid AID value %d (out of range), turn off PS\n",
2043                            aid);
2044                 aid = 0;
2045                 ifmgd->broken_ap = true;
2046         }
2047
2048         pos = mgmt->u.assoc_resp.variable;
2049         ieee802_11_parse_elems(pos, len - (pos - (u8 *) mgmt), &elems);
2050
2051         if (!elems.supp_rates) {
2052                 sdata_info(sdata, "no SuppRates element in AssocResp\n");
2053                 return false;
2054         }
2055
2056         ifmgd->aid = aid;
2057
2058         mutex_lock(&sdata->local->sta_mtx);
2059         /*
2060          * station info was already allocated and inserted before
2061          * the association and should be available to us
2062          */
2063         sta = sta_info_get(sdata, cbss->bssid);
2064         if (WARN_ON(!sta)) {
2065                 mutex_unlock(&sdata->local->sta_mtx);
2066                 return false;
2067         }
2068
2069         sband = local->hw.wiphy->bands[local->oper_channel->band];
2070
2071         if (elems.ht_cap_elem && !(ifmgd->flags & IEEE80211_STA_DISABLE_11N))
2072                 ieee80211_ht_cap_ie_to_sta_ht_cap(sdata, sband,
2073                                 elems.ht_cap_elem, &sta->sta.ht_cap);
2074
2075         sta->supports_40mhz =
2076                 sta->sta.ht_cap.cap & IEEE80211_HT_CAP_SUP_WIDTH_20_40;
2077
2078         rate_control_rate_init(sta);
2079
2080         if (ifmgd->flags & IEEE80211_STA_MFP_ENABLED)
2081                 set_sta_flag(sta, WLAN_STA_MFP);
2082
2083         if (elems.wmm_param)
2084                 set_sta_flag(sta, WLAN_STA_WME);
2085
2086         err = sta_info_move_state(sta, IEEE80211_STA_AUTH);
2087         if (!err)
2088                 err = sta_info_move_state(sta, IEEE80211_STA_ASSOC);
2089         if (!err && !(ifmgd->flags & IEEE80211_STA_CONTROL_PORT))
2090                 err = sta_info_move_state(sta, IEEE80211_STA_AUTHORIZED);
2091         if (err) {
2092                 sdata_info(sdata,
2093                            "failed to move station %pM to desired state\n",
2094                            sta->sta.addr);
2095                 WARN_ON(__sta_info_destroy(sta));
2096                 mutex_unlock(&sdata->local->sta_mtx);
2097                 return false;
2098         }
2099
2100         mutex_unlock(&sdata->local->sta_mtx);
2101
2102         /*
2103          * Always handle WMM once after association regardless
2104          * of the first value the AP uses. Setting -1 here has
2105          * that effect because the AP values is an unsigned
2106          * 4-bit value.
2107          */
2108         ifmgd->wmm_last_param_set = -1;
2109
2110         if (elems.wmm_param)
2111                 ieee80211_sta_wmm_params(local, sdata, elems.wmm_param,
2112                                          elems.wmm_param_len);
2113         else
2114                 ieee80211_set_wmm_default(sdata, false);
2115         changed |= BSS_CHANGED_QOS;
2116
2117         if (elems.ht_operation && elems.wmm_param &&
2118             !(ifmgd->flags & IEEE80211_STA_DISABLE_11N))
2119                 changed |= ieee80211_config_ht_tx(sdata, elems.ht_operation,
2120                                                   cbss->bssid, false);
2121
2122         /* set AID and assoc capability,
2123          * ieee80211_set_associated() will tell the driver */
2124         bss_conf->aid = aid;
2125         bss_conf->assoc_capability = capab_info;
2126         ieee80211_set_associated(sdata, cbss, changed);
2127
2128         /*
2129          * If we're using 4-addr mode, let the AP know that we're
2130          * doing so, so that it can create the STA VLAN on its side
2131          */
2132         if (ifmgd->use_4addr)
2133                 ieee80211_send_4addr_nullfunc(local, sdata);
2134
2135         /*
2136          * Start timer to probe the connection to the AP now.
2137          * Also start the timer that will detect beacon loss.
2138          */
2139         ieee80211_sta_rx_notify(sdata, (struct ieee80211_hdr *)mgmt);
2140         ieee80211_sta_reset_beacon_monitor(sdata);
2141
2142         return true;
2143 }
2144
2145 static enum rx_mgmt_action __must_check
2146 ieee80211_rx_mgmt_assoc_resp(struct ieee80211_sub_if_data *sdata,
2147                              struct ieee80211_mgmt *mgmt, size_t len,
2148                              struct cfg80211_bss **bss)
2149 {
2150         struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
2151         struct ieee80211_mgd_assoc_data *assoc_data = ifmgd->assoc_data;
2152         u16 capab_info, status_code, aid;
2153         struct ieee802_11_elems elems;
2154         u8 *pos;
2155         bool reassoc;
2156
2157         lockdep_assert_held(&ifmgd->mtx);
2158
2159         if (!assoc_data)
2160                 return RX_MGMT_NONE;
2161         if (!ether_addr_equal(assoc_data->bss->bssid, mgmt->bssid))
2162                 return RX_MGMT_NONE;
2163
2164         /*
2165          * AssocResp and ReassocResp have identical structure, so process both
2166          * of them in this function.
2167          */
2168
2169         if (len < 24 + 6)
2170                 return RX_MGMT_NONE;
2171
2172         reassoc = ieee80211_is_reassoc_req(mgmt->frame_control);
2173         capab_info = le16_to_cpu(mgmt->u.assoc_resp.capab_info);
2174         status_code = le16_to_cpu(mgmt->u.assoc_resp.status_code);
2175         aid = le16_to_cpu(mgmt->u.assoc_resp.aid);
2176
2177         sdata_info(sdata,
2178                    "RX %sssocResp from %pM (capab=0x%x status=%d aid=%d)\n",
2179                    reassoc ? "Rea" : "A", mgmt->sa,
2180                    capab_info, status_code, (u16)(aid & ~(BIT(15) | BIT(14))));
2181
2182         pos = mgmt->u.assoc_resp.variable;
2183         ieee802_11_parse_elems(pos, len - (pos - (u8 *) mgmt), &elems);
2184
2185         if (status_code == WLAN_STATUS_ASSOC_REJECTED_TEMPORARILY &&
2186             elems.timeout_int && elems.timeout_int_len == 5 &&
2187             elems.timeout_int[0] == WLAN_TIMEOUT_ASSOC_COMEBACK) {
2188                 u32 tu, ms;
2189                 tu = get_unaligned_le32(elems.timeout_int + 1);
2190                 ms = tu * 1024 / 1000;
2191                 sdata_info(sdata,
2192                            "%pM rejected association temporarily; comeback duration %u TU (%u ms)\n",
2193                            mgmt->sa, tu, ms);
2194                 assoc_data->timeout = jiffies + msecs_to_jiffies(ms);
2195                 if (ms > IEEE80211_ASSOC_TIMEOUT)
2196                         run_again(ifmgd, assoc_data->timeout);
2197                 return RX_MGMT_NONE;
2198         }
2199
2200         *bss = assoc_data->bss;
2201
2202         if (status_code != WLAN_STATUS_SUCCESS) {
2203                 sdata_info(sdata, "%pM denied association (code=%d)\n",
2204                            mgmt->sa, status_code);
2205                 ieee80211_destroy_assoc_data(sdata, false);
2206         } else {
2207                 if (!ieee80211_assoc_success(sdata, *bss, mgmt, len)) {
2208                         /* oops -- internal error -- send timeout for now */
2209                         ieee80211_destroy_assoc_data(sdata, false);
2210                         cfg80211_put_bss(*bss);
2211                         return RX_MGMT_CFG80211_ASSOC_TIMEOUT;
2212                 }
2213                 sdata_info(sdata, "associated\n");
2214
2215                 /*
2216                  * destroy assoc_data afterwards, as otherwise an idle
2217                  * recalc after assoc_data is NULL but before associated
2218                  * is set can cause the interface to go idle
2219                  */
2220                 ieee80211_destroy_assoc_data(sdata, true);
2221         }
2222
2223         return RX_MGMT_CFG80211_RX_ASSOC;
2224 }
2225 static void ieee80211_rx_bss_info(struct ieee80211_sub_if_data *sdata,
2226                                   struct ieee80211_mgmt *mgmt,
2227                                   size_t len,
2228                                   struct ieee80211_rx_status *rx_status,
2229                                   struct ieee802_11_elems *elems,
2230                                   bool beacon)
2231 {
2232         struct ieee80211_local *local = sdata->local;
2233         int freq;
2234         struct ieee80211_bss *bss;
2235         struct ieee80211_channel *channel;
2236         bool need_ps = false;
2237
2238         if (sdata->u.mgd.associated &&
2239             ether_addr_equal(mgmt->bssid, sdata->u.mgd.associated->bssid)) {
2240                 bss = (void *)sdata->u.mgd.associated->priv;
2241                 /* not previously set so we may need to recalc */
2242                 need_ps = !bss->dtim_period;
2243         }
2244
2245         if (elems->ds_params && elems->ds_params_len == 1)
2246                 freq = ieee80211_channel_to_frequency(elems->ds_params[0],
2247                                                       rx_status->band);
2248         else
2249                 freq = rx_status->freq;
2250
2251         channel = ieee80211_get_channel(local->hw.wiphy, freq);
2252
2253         if (!channel || channel->flags & IEEE80211_CHAN_DISABLED)
2254                 return;
2255
2256         bss = ieee80211_bss_info_update(local, rx_status, mgmt, len, elems,
2257                                         channel, beacon);
2258         if (bss)
2259                 ieee80211_rx_bss_put(local, bss);
2260
2261         if (!sdata->u.mgd.associated)
2262                 return;
2263
2264         if (need_ps) {
2265                 mutex_lock(&local->iflist_mtx);
2266                 ieee80211_recalc_ps(local, -1);
2267                 mutex_unlock(&local->iflist_mtx);
2268         }
2269
2270         if (elems->ch_switch_ie &&
2271             memcmp(mgmt->bssid, sdata->u.mgd.associated->bssid, ETH_ALEN) == 0)
2272                 ieee80211_sta_process_chanswitch(sdata, elems->ch_switch_ie,
2273                                                  bss, rx_status->mactime);
2274 }
2275
2276
2277 static void ieee80211_rx_mgmt_probe_resp(struct ieee80211_sub_if_data *sdata,
2278                                          struct sk_buff *skb)
2279 {
2280         struct ieee80211_mgmt *mgmt = (void *)skb->data;
2281         struct ieee80211_if_managed *ifmgd;
2282         struct ieee80211_rx_status *rx_status = (void *) skb->cb;
2283         size_t baselen, len = skb->len;
2284         struct ieee802_11_elems elems;
2285
2286         ifmgd = &sdata->u.mgd;
2287
2288         ASSERT_MGD_MTX(ifmgd);
2289
2290         if (!ether_addr_equal(mgmt->da, sdata->vif.addr))
2291                 return; /* ignore ProbeResp to foreign address */
2292
2293         baselen = (u8 *) mgmt->u.probe_resp.variable - (u8 *) mgmt;
2294         if (baselen > len)
2295                 return;
2296
2297         ieee802_11_parse_elems(mgmt->u.probe_resp.variable, len - baselen,
2298                                 &elems);
2299
2300         ieee80211_rx_bss_info(sdata, mgmt, len, rx_status, &elems, false);
2301
2302         if (ifmgd->associated &&
2303             ether_addr_equal(mgmt->bssid, ifmgd->associated->bssid))
2304                 ieee80211_reset_ap_probe(sdata);
2305
2306         if (ifmgd->auth_data && !ifmgd->auth_data->bss->proberesp_ies &&
2307             ether_addr_equal(mgmt->bssid, ifmgd->auth_data->bss->bssid)) {
2308                 /* got probe response, continue with auth */
2309                 sdata_info(sdata, "direct probe responded\n");
2310                 ifmgd->auth_data->tries = 0;
2311                 ifmgd->auth_data->timeout = jiffies;
2312                 run_again(ifmgd, ifmgd->auth_data->timeout);
2313         }
2314 }
2315
2316 /*
2317  * This is the canonical list of information elements we care about,
2318  * the filter code also gives us all changes to the Microsoft OUI
2319  * (00:50:F2) vendor IE which is used for WMM which we need to track.
2320  *
2321  * We implement beacon filtering in software since that means we can
2322  * avoid processing the frame here and in cfg80211, and userspace
2323  * will not be able to tell whether the hardware supports it or not.
2324  *
2325  * XXX: This list needs to be dynamic -- userspace needs to be able to
2326  *      add items it requires. It also needs to be able to tell us to
2327  *      look out for other vendor IEs.
2328  */
2329 static const u64 care_about_ies =
2330         (1ULL << WLAN_EID_COUNTRY) |
2331         (1ULL << WLAN_EID_ERP_INFO) |
2332         (1ULL << WLAN_EID_CHANNEL_SWITCH) |
2333         (1ULL << WLAN_EID_PWR_CONSTRAINT) |
2334         (1ULL << WLAN_EID_HT_CAPABILITY) |
2335         (1ULL << WLAN_EID_HT_OPERATION);
2336
2337 static void ieee80211_rx_mgmt_beacon(struct ieee80211_sub_if_data *sdata,
2338                                      struct ieee80211_mgmt *mgmt,
2339                                      size_t len,
2340                                      struct ieee80211_rx_status *rx_status)
2341 {
2342         struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
2343         struct ieee80211_bss_conf *bss_conf = &sdata->vif.bss_conf;
2344         size_t baselen;
2345         struct ieee802_11_elems elems;
2346         struct ieee80211_local *local = sdata->local;
2347         u32 changed = 0;
2348         bool erp_valid, directed_tim = false;
2349         u8 erp_value = 0;
2350         u32 ncrc;
2351         u8 *bssid;
2352
2353         lockdep_assert_held(&ifmgd->mtx);
2354
2355         /* Process beacon from the current BSS */
2356         baselen = (u8 *) mgmt->u.beacon.variable - (u8 *) mgmt;
2357         if (baselen > len)
2358                 return;
2359
2360         if (rx_status->freq != local->oper_channel->center_freq)
2361                 return;
2362
2363         if (ifmgd->assoc_data && !ifmgd->assoc_data->have_beacon &&
2364             ether_addr_equal(mgmt->bssid, ifmgd->assoc_data->bss->bssid)) {
2365                 ieee802_11_parse_elems(mgmt->u.beacon.variable,
2366                                        len - baselen, &elems);
2367
2368                 ieee80211_rx_bss_info(sdata, mgmt, len, rx_status, &elems,
2369                                       false);
2370                 ifmgd->assoc_data->have_beacon = true;
2371                 ifmgd->assoc_data->sent_assoc = false;
2372                 /* continue assoc process */
2373                 ifmgd->assoc_data->timeout = jiffies;
2374                 run_again(ifmgd, ifmgd->assoc_data->timeout);
2375                 return;
2376         }
2377
2378         if (!ifmgd->associated ||
2379             !ether_addr_equal(mgmt->bssid, ifmgd->associated->bssid))
2380                 return;
2381         bssid = ifmgd->associated->bssid;
2382
2383         /* Track average RSSI from the Beacon frames of the current AP */
2384         ifmgd->last_beacon_signal = rx_status->signal;
2385         if (ifmgd->flags & IEEE80211_STA_RESET_SIGNAL_AVE) {
2386                 ifmgd->flags &= ~IEEE80211_STA_RESET_SIGNAL_AVE;
2387                 ifmgd->ave_beacon_signal = rx_status->signal * 16;
2388                 ifmgd->last_cqm_event_signal = 0;
2389                 ifmgd->count_beacon_signal = 1;
2390                 ifmgd->last_ave_beacon_signal = 0;
2391         } else {
2392                 ifmgd->ave_beacon_signal =
2393                         (IEEE80211_SIGNAL_AVE_WEIGHT * rx_status->signal * 16 +
2394                          (16 - IEEE80211_SIGNAL_AVE_WEIGHT) *
2395                          ifmgd->ave_beacon_signal) / 16;
2396                 ifmgd->count_beacon_signal++;
2397         }
2398
2399         if (ifmgd->rssi_min_thold != ifmgd->rssi_max_thold &&
2400             ifmgd->count_beacon_signal >= IEEE80211_SIGNAL_AVE_MIN_COUNT) {
2401                 int sig = ifmgd->ave_beacon_signal;
2402                 int last_sig = ifmgd->last_ave_beacon_signal;
2403
2404                 /*
2405                  * if signal crosses either of the boundaries, invoke callback
2406                  * with appropriate parameters
2407                  */
2408                 if (sig > ifmgd->rssi_max_thold &&
2409                     (last_sig <= ifmgd->rssi_min_thold || last_sig == 0)) {
2410                         ifmgd->last_ave_beacon_signal = sig;
2411                         drv_rssi_callback(local, RSSI_EVENT_HIGH);
2412                 } else if (sig < ifmgd->rssi_min_thold &&
2413                            (last_sig >= ifmgd->rssi_max_thold ||
2414                            last_sig == 0)) {
2415                         ifmgd->last_ave_beacon_signal = sig;
2416                         drv_rssi_callback(local, RSSI_EVENT_LOW);
2417                 }
2418         }
2419
2420         if (bss_conf->cqm_rssi_thold &&
2421             ifmgd->count_beacon_signal >= IEEE80211_SIGNAL_AVE_MIN_COUNT &&
2422             !(sdata->vif.driver_flags & IEEE80211_VIF_SUPPORTS_CQM_RSSI)) {
2423                 int sig = ifmgd->ave_beacon_signal / 16;
2424                 int last_event = ifmgd->last_cqm_event_signal;
2425                 int thold = bss_conf->cqm_rssi_thold;
2426                 int hyst = bss_conf->cqm_rssi_hyst;
2427                 if (sig < thold &&
2428                     (last_event == 0 || sig < last_event - hyst)) {
2429                         ifmgd->last_cqm_event_signal = sig;
2430                         ieee80211_cqm_rssi_notify(
2431                                 &sdata->vif,
2432                                 NL80211_CQM_RSSI_THRESHOLD_EVENT_LOW,
2433                                 GFP_KERNEL);
2434                 } else if (sig > thold &&
2435                            (last_event == 0 || sig > last_event + hyst)) {
2436                         ifmgd->last_cqm_event_signal = sig;
2437                         ieee80211_cqm_rssi_notify(
2438                                 &sdata->vif,
2439                                 NL80211_CQM_RSSI_THRESHOLD_EVENT_HIGH,
2440                                 GFP_KERNEL);
2441                 }
2442         }
2443
2444         if (ifmgd->flags & IEEE80211_STA_BEACON_POLL) {
2445                 mlme_dbg_ratelimited(sdata,
2446                                      "cancelling probereq poll due to a received beacon\n");
2447                 mutex_lock(&local->mtx);
2448                 ifmgd->flags &= ~IEEE80211_STA_BEACON_POLL;
2449                 ieee80211_run_deferred_scan(local);
2450                 mutex_unlock(&local->mtx);
2451
2452                 mutex_lock(&local->iflist_mtx);
2453                 ieee80211_recalc_ps(local, -1);
2454                 mutex_unlock(&local->iflist_mtx);
2455         }
2456
2457         /*
2458          * Push the beacon loss detection into the future since
2459          * we are processing a beacon from the AP just now.
2460          */
2461         ieee80211_sta_reset_beacon_monitor(sdata);
2462
2463         ncrc = crc32_be(0, (void *)&mgmt->u.beacon.beacon_int, 4);
2464         ncrc = ieee802_11_parse_elems_crc(mgmt->u.beacon.variable,
2465                                           len - baselen, &elems,
2466                                           care_about_ies, ncrc);
2467
2468         if (local->hw.flags & IEEE80211_HW_PS_NULLFUNC_STACK)
2469                 directed_tim = ieee80211_check_tim(elems.tim, elems.tim_len,
2470                                                    ifmgd->aid);
2471
2472         if (local->hw.flags & IEEE80211_HW_PS_NULLFUNC_STACK) {
2473                 if (directed_tim) {
2474                         if (local->hw.conf.dynamic_ps_timeout > 0) {
2475                                 if (local->hw.conf.flags & IEEE80211_CONF_PS) {
2476                                         local->hw.conf.flags &= ~IEEE80211_CONF_PS;
2477                                         ieee80211_hw_config(local,
2478                                                             IEEE80211_CONF_CHANGE_PS);
2479                                 }
2480                                 ieee80211_send_nullfunc(local, sdata, 0);
2481                         } else if (!local->pspolling && sdata->u.mgd.powersave) {
2482                                 local->pspolling = true;
2483
2484                                 /*
2485                                  * Here is assumed that the driver will be
2486                                  * able to send ps-poll frame and receive a
2487                                  * response even though power save mode is
2488                                  * enabled, but some drivers might require
2489                                  * to disable power save here. This needs
2490                                  * to be investigated.
2491                                  */
2492                                 ieee80211_send_pspoll(local, sdata);
2493                         }
2494                 }
2495         }
2496
2497         if (ncrc == ifmgd->beacon_crc && ifmgd->beacon_crc_valid)
2498                 return;
2499         ifmgd->beacon_crc = ncrc;
2500         ifmgd->beacon_crc_valid = true;
2501
2502         ieee80211_rx_bss_info(sdata, mgmt, len, rx_status, &elems,
2503                               true);
2504
2505         if (ieee80211_sta_wmm_params(local, sdata, elems.wmm_param,
2506                                      elems.wmm_param_len))
2507                 changed |= BSS_CHANGED_QOS;
2508
2509         if (elems.erp_info && elems.erp_info_len >= 1) {
2510                 erp_valid = true;
2511                 erp_value = elems.erp_info[0];
2512         } else {
2513                 erp_valid = false;
2514         }
2515         changed |= ieee80211_handle_bss_capability(sdata,
2516                         le16_to_cpu(mgmt->u.beacon.capab_info),
2517                         erp_valid, erp_value);
2518
2519
2520         if (elems.ht_cap_elem && elems.ht_operation && elems.wmm_param &&
2521             !(ifmgd->flags & IEEE80211_STA_DISABLE_11N)) {
2522                 struct ieee80211_supported_band *sband;
2523
2524                 sband = local->hw.wiphy->bands[local->oper_channel->band];
2525
2526                 changed |= ieee80211_config_ht_tx(sdata, elems.ht_operation,
2527                                                   bssid, true);
2528         }
2529
2530         /* Note: country IE parsing is done for us by cfg80211 */
2531         if (elems.country_elem) {
2532                 /* TODO: IBSS also needs this */
2533                 if (elems.pwr_constr_elem)
2534                         ieee80211_handle_pwr_constr(sdata,
2535                                 le16_to_cpu(mgmt->u.probe_resp.capab_info),
2536                                 elems.pwr_constr_elem,
2537                                 elems.pwr_constr_elem_len);
2538         }
2539
2540         ieee80211_bss_info_change_notify(sdata, changed);
2541 }
2542
2543 void ieee80211_sta_rx_queued_mgmt(struct ieee80211_sub_if_data *sdata,
2544                                   struct sk_buff *skb)
2545 {
2546         struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
2547         struct ieee80211_rx_status *rx_status;
2548         struct ieee80211_mgmt *mgmt;
2549         struct cfg80211_bss *bss = NULL;
2550         enum rx_mgmt_action rma = RX_MGMT_NONE;
2551         u16 fc;
2552
2553         rx_status = (struct ieee80211_rx_status *) skb->cb;
2554         mgmt = (struct ieee80211_mgmt *) skb->data;
2555         fc = le16_to_cpu(mgmt->frame_control);
2556
2557         mutex_lock(&ifmgd->mtx);
2558
2559         switch (fc & IEEE80211_FCTL_STYPE) {
2560         case IEEE80211_STYPE_BEACON:
2561                 ieee80211_rx_mgmt_beacon(sdata, mgmt, skb->len, rx_status);
2562                 break;
2563         case IEEE80211_STYPE_PROBE_RESP:
2564                 ieee80211_rx_mgmt_probe_resp(sdata, skb);
2565                 break;
2566         case IEEE80211_STYPE_AUTH:
2567                 rma = ieee80211_rx_mgmt_auth(sdata, mgmt, skb->len);
2568                 break;
2569         case IEEE80211_STYPE_DEAUTH:
2570                 rma = ieee80211_rx_mgmt_deauth(sdata, mgmt, skb->len);
2571                 break;
2572         case IEEE80211_STYPE_DISASSOC:
2573                 rma = ieee80211_rx_mgmt_disassoc(sdata, mgmt, skb->len);
2574                 break;
2575         case IEEE80211_STYPE_ASSOC_RESP:
2576         case IEEE80211_STYPE_REASSOC_RESP:
2577                 rma = ieee80211_rx_mgmt_assoc_resp(sdata, mgmt, skb->len, &bss);
2578                 break;
2579         case IEEE80211_STYPE_ACTION:
2580                 switch (mgmt->u.action.category) {
2581                 case WLAN_CATEGORY_SPECTRUM_MGMT:
2582                         ieee80211_sta_process_chanswitch(sdata,
2583                                         &mgmt->u.action.u.chan_switch.sw_elem,
2584                                         (void *)ifmgd->associated->priv,
2585                                         rx_status->mactime);
2586                         break;
2587                 }
2588         }
2589         mutex_unlock(&ifmgd->mtx);
2590
2591         switch (rma) {
2592         case RX_MGMT_NONE:
2593                 /* no action */
2594                 break;
2595         case RX_MGMT_CFG80211_DEAUTH:
2596                 cfg80211_send_deauth(sdata->dev, (u8 *)mgmt, skb->len);
2597                 break;
2598         case RX_MGMT_CFG80211_DISASSOC:
2599                 cfg80211_send_disassoc(sdata->dev, (u8 *)mgmt, skb->len);
2600                 break;
2601         case RX_MGMT_CFG80211_RX_AUTH:
2602                 cfg80211_send_rx_auth(sdata->dev, (u8 *)mgmt, skb->len);
2603                 break;
2604         case RX_MGMT_CFG80211_RX_ASSOC:
2605                 cfg80211_send_rx_assoc(sdata->dev, bss, (u8 *)mgmt, skb->len);
2606                 break;
2607         case RX_MGMT_CFG80211_ASSOC_TIMEOUT:
2608                 cfg80211_send_assoc_timeout(sdata->dev, mgmt->bssid);
2609                 break;
2610         default:
2611                 WARN(1, "unexpected: %d", rma);
2612         }
2613 }
2614
2615 static void ieee80211_sta_timer(unsigned long data)
2616 {
2617         struct ieee80211_sub_if_data *sdata =
2618                 (struct ieee80211_sub_if_data *) data;
2619         struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
2620         struct ieee80211_local *local = sdata->local;
2621
2622         if (local->quiescing) {
2623                 set_bit(TMR_RUNNING_TIMER, &ifmgd->timers_running);
2624                 return;
2625         }
2626
2627         ieee80211_queue_work(&local->hw, &sdata->work);
2628 }
2629
2630 static void ieee80211_sta_connection_lost(struct ieee80211_sub_if_data *sdata,
2631                                           u8 *bssid, u8 reason)
2632 {
2633         struct ieee80211_local *local = sdata->local;
2634         struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
2635         u8 frame_buf[DEAUTH_DISASSOC_LEN];
2636
2637         ieee80211_set_disassoc(sdata, IEEE80211_STYPE_DEAUTH, reason,
2638                                false, frame_buf);
2639         mutex_unlock(&ifmgd->mtx);
2640
2641         /*
2642          * must be outside lock due to cfg80211,
2643          * but that's not a problem.
2644          */
2645         cfg80211_send_deauth(sdata->dev, frame_buf, DEAUTH_DISASSOC_LEN);
2646
2647         mutex_lock(&local->mtx);
2648         ieee80211_recalc_idle(local);
2649         mutex_unlock(&local->mtx);
2650
2651         mutex_lock(&ifmgd->mtx);
2652 }
2653
2654 static int ieee80211_probe_auth(struct ieee80211_sub_if_data *sdata)
2655 {
2656         struct ieee80211_local *local = sdata->local;
2657         struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
2658         struct ieee80211_mgd_auth_data *auth_data = ifmgd->auth_data;
2659
2660         lockdep_assert_held(&ifmgd->mtx);
2661
2662         if (WARN_ON_ONCE(!auth_data))
2663                 return -EINVAL;
2664
2665         auth_data->tries++;
2666
2667         if (auth_data->tries > IEEE80211_AUTH_MAX_TRIES) {
2668                 sdata_info(sdata, "authentication with %pM timed out\n",
2669                            auth_data->bss->bssid);
2670
2671                 /*
2672                  * Most likely AP is not in the range so remove the
2673                  * bss struct for that AP.
2674                  */
2675                 cfg80211_unlink_bss(local->hw.wiphy, auth_data->bss);
2676
2677                 return -ETIMEDOUT;
2678         }
2679
2680         drv_mgd_prepare_tx(local, sdata);
2681
2682         if (auth_data->bss->proberesp_ies) {
2683                 sdata_info(sdata, "send auth to %pM (try %d/%d)\n",
2684                            auth_data->bss->bssid, auth_data->tries,
2685                            IEEE80211_AUTH_MAX_TRIES);
2686
2687                 auth_data->expected_transaction = 2;
2688                 ieee80211_send_auth(sdata, 1, auth_data->algorithm,
2689                                     auth_data->ie, auth_data->ie_len,
2690                                     auth_data->bss->bssid,
2691                                     auth_data->bss->bssid, NULL, 0, 0);
2692         } else {
2693                 const u8 *ssidie;
2694
2695                 sdata_info(sdata, "direct probe to %pM (try %d/%i)\n",
2696                            auth_data->bss->bssid, auth_data->tries,
2697                            IEEE80211_AUTH_MAX_TRIES);
2698
2699                 ssidie = ieee80211_bss_get_ie(auth_data->bss, WLAN_EID_SSID);
2700                 if (!ssidie)
2701                         return -EINVAL;
2702                 /*
2703                  * Direct probe is sent to broadcast address as some APs
2704                  * will not answer to direct packet in unassociated state.
2705                  */
2706                 ieee80211_send_probe_req(sdata, NULL, ssidie + 2, ssidie[1],
2707                                          NULL, 0, (u32) -1, true, false);
2708         }
2709
2710         auth_data->timeout = jiffies + IEEE80211_AUTH_TIMEOUT;
2711         run_again(ifmgd, auth_data->timeout);
2712
2713         return 0;
2714 }
2715
2716 static int ieee80211_do_assoc(struct ieee80211_sub_if_data *sdata)
2717 {
2718         struct ieee80211_mgd_assoc_data *assoc_data = sdata->u.mgd.assoc_data;
2719         struct ieee80211_local *local = sdata->local;
2720
2721         lockdep_assert_held(&sdata->u.mgd.mtx);
2722
2723         assoc_data->tries++;
2724         if (assoc_data->tries > IEEE80211_ASSOC_MAX_TRIES) {
2725                 sdata_info(sdata, "association with %pM timed out\n",
2726                            assoc_data->bss->bssid);
2727
2728                 /*
2729                  * Most likely AP is not in the range so remove the
2730                  * bss struct for that AP.
2731                  */
2732                 cfg80211_unlink_bss(local->hw.wiphy, assoc_data->bss);
2733
2734                 return -ETIMEDOUT;
2735         }
2736
2737         sdata_info(sdata, "associate with %pM (try %d/%d)\n",
2738                    assoc_data->bss->bssid, assoc_data->tries,
2739                    IEEE80211_ASSOC_MAX_TRIES);
2740         ieee80211_send_assoc(sdata);
2741
2742         assoc_data->timeout = jiffies + IEEE80211_ASSOC_TIMEOUT;
2743         run_again(&sdata->u.mgd, assoc_data->timeout);
2744
2745         return 0;
2746 }
2747
2748 void ieee80211_sta_work(struct ieee80211_sub_if_data *sdata)
2749 {
2750         struct ieee80211_local *local = sdata->local;
2751         struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
2752
2753         mutex_lock(&ifmgd->mtx);
2754
2755         if (ifmgd->auth_data &&
2756             time_after(jiffies, ifmgd->auth_data->timeout)) {
2757                 if (ifmgd->auth_data->done) {
2758                         /*
2759                          * ok ... we waited for assoc but userspace didn't,
2760                          * so let's just kill the auth data
2761                          */
2762                         ieee80211_destroy_auth_data(sdata, false);
2763                 } else if (ieee80211_probe_auth(sdata)) {
2764                         u8 bssid[ETH_ALEN];
2765
2766                         memcpy(bssid, ifmgd->auth_data->bss->bssid, ETH_ALEN);
2767
2768                         ieee80211_destroy_auth_data(sdata, false);
2769
2770                         mutex_unlock(&ifmgd->mtx);
2771                         cfg80211_send_auth_timeout(sdata->dev, bssid);
2772                         mutex_lock(&ifmgd->mtx);
2773                 }
2774         } else if (ifmgd->auth_data)
2775                 run_again(ifmgd, ifmgd->auth_data->timeout);
2776
2777         if (ifmgd->assoc_data &&
2778             time_after(jiffies, ifmgd->assoc_data->timeout)) {
2779                 if (!ifmgd->assoc_data->have_beacon ||
2780                     ieee80211_do_assoc(sdata)) {
2781                         u8 bssid[ETH_ALEN];
2782
2783                         memcpy(bssid, ifmgd->assoc_data->bss->bssid, ETH_ALEN);
2784
2785                         ieee80211_destroy_assoc_data(sdata, false);
2786
2787                         mutex_unlock(&ifmgd->mtx);
2788                         cfg80211_send_assoc_timeout(sdata->dev, bssid);
2789                         mutex_lock(&ifmgd->mtx);
2790                 }
2791         } else if (ifmgd->assoc_data)
2792                 run_again(ifmgd, ifmgd->assoc_data->timeout);
2793
2794         if (ifmgd->flags & (IEEE80211_STA_BEACON_POLL |
2795                             IEEE80211_STA_CONNECTION_POLL) &&
2796             ifmgd->associated) {
2797                 u8 bssid[ETH_ALEN];
2798                 int max_tries;
2799
2800                 memcpy(bssid, ifmgd->associated->bssid, ETH_ALEN);
2801
2802                 if (local->hw.flags & IEEE80211_HW_REPORTS_TX_ACK_STATUS)
2803                         max_tries = max_nullfunc_tries;
2804                 else
2805                         max_tries = max_probe_tries;
2806
2807                 /* ACK received for nullfunc probing frame */
2808                 if (!ifmgd->probe_send_count)
2809                         ieee80211_reset_ap_probe(sdata);
2810                 else if (ifmgd->nullfunc_failed) {
2811                         if (ifmgd->probe_send_count < max_tries) {
2812                                 mlme_dbg(sdata,
2813                                          "No ack for nullfunc frame to AP %pM, try %d/%i\n",
2814                                          bssid, ifmgd->probe_send_count,
2815                                          max_tries);
2816                                 ieee80211_mgd_probe_ap_send(sdata);
2817                         } else {
2818                                 mlme_dbg(sdata,
2819                                          "No ack for nullfunc frame to AP %pM, disconnecting.\n",
2820                                          bssid);
2821                                 ieee80211_sta_connection_lost(sdata, bssid,
2822                                         WLAN_REASON_DISASSOC_DUE_TO_INACTIVITY);
2823                         }
2824                 } else if (time_is_after_jiffies(ifmgd->probe_timeout))
2825                         run_again(ifmgd, ifmgd->probe_timeout);
2826                 else if (local->hw.flags & IEEE80211_HW_REPORTS_TX_ACK_STATUS) {
2827                         mlme_dbg(sdata,
2828                                  "Failed to send nullfunc to AP %pM after %dms, disconnecting\n",
2829                                  bssid, probe_wait_ms);
2830                         ieee80211_sta_connection_lost(sdata, bssid,
2831                                 WLAN_REASON_DISASSOC_DUE_TO_INACTIVITY);
2832                 } else if (ifmgd->probe_send_count < max_tries) {
2833                         mlme_dbg(sdata,
2834                                  "No probe response from AP %pM after %dms, try %d/%i\n",
2835                                  bssid, probe_wait_ms,
2836                                  ifmgd->probe_send_count, max_tries);
2837                         ieee80211_mgd_probe_ap_send(sdata);
2838                 } else {
2839                         /*
2840                          * We actually lost the connection ... or did we?
2841                          * Let's make sure!
2842                          */
2843                         wiphy_debug(local->hw.wiphy,
2844                                     "%s: No probe response from AP %pM"
2845                                     " after %dms, disconnecting.\n",
2846                                     sdata->name,
2847                                     bssid, probe_wait_ms);
2848
2849                         ieee80211_sta_connection_lost(sdata, bssid,
2850                                 WLAN_REASON_DISASSOC_DUE_TO_INACTIVITY);
2851                 }
2852         }
2853
2854         mutex_unlock(&ifmgd->mtx);
2855
2856         mutex_lock(&local->mtx);
2857         ieee80211_recalc_idle(local);
2858         mutex_unlock(&local->mtx);
2859 }
2860
2861 static void ieee80211_sta_bcn_mon_timer(unsigned long data)
2862 {
2863         struct ieee80211_sub_if_data *sdata =
2864                 (struct ieee80211_sub_if_data *) data;
2865         struct ieee80211_local *local = sdata->local;
2866
2867         if (local->quiescing)
2868                 return;
2869
2870         ieee80211_queue_work(&sdata->local->hw,
2871                              &sdata->u.mgd.beacon_connection_loss_work);
2872 }
2873
2874 static void ieee80211_sta_conn_mon_timer(unsigned long data)
2875 {
2876         struct ieee80211_sub_if_data *sdata =
2877                 (struct ieee80211_sub_if_data *) data;
2878         struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
2879         struct ieee80211_local *local = sdata->local;
2880
2881         if (local->quiescing)
2882                 return;
2883
2884         ieee80211_queue_work(&local->hw, &ifmgd->monitor_work);
2885 }
2886
2887 static void ieee80211_sta_monitor_work(struct work_struct *work)
2888 {
2889         struct ieee80211_sub_if_data *sdata =
2890                 container_of(work, struct ieee80211_sub_if_data,
2891                              u.mgd.monitor_work);
2892
2893         ieee80211_mgd_probe_ap(sdata, false);
2894 }
2895
2896 static void ieee80211_restart_sta_timer(struct ieee80211_sub_if_data *sdata)
2897 {
2898         u32 flags;
2899
2900         if (sdata->vif.type == NL80211_IFTYPE_STATION) {
2901                 __ieee80211_stop_poll(sdata);
2902
2903                 /* let's probe the connection once */
2904                 flags = sdata->local->hw.flags;
2905                 if (!(flags & IEEE80211_HW_CONNECTION_MONITOR))
2906                         ieee80211_queue_work(&sdata->local->hw,
2907                                              &sdata->u.mgd.monitor_work);
2908                 /* and do all the other regular work too */
2909                 ieee80211_queue_work(&sdata->local->hw, &sdata->work);
2910         }
2911 }
2912
2913 #ifdef CONFIG_PM
2914 void ieee80211_sta_quiesce(struct ieee80211_sub_if_data *sdata)
2915 {
2916         struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
2917
2918         /*
2919          * we need to use atomic bitops for the running bits
2920          * only because both timers might fire at the same
2921          * time -- the code here is properly synchronised.
2922          */
2923
2924         cancel_work_sync(&ifmgd->request_smps_work);
2925
2926         cancel_work_sync(&ifmgd->monitor_work);
2927         cancel_work_sync(&ifmgd->beacon_connection_loss_work);
2928         if (del_timer_sync(&ifmgd->timer))
2929                 set_bit(TMR_RUNNING_TIMER, &ifmgd->timers_running);
2930
2931         cancel_work_sync(&ifmgd->chswitch_work);
2932         if (del_timer_sync(&ifmgd->chswitch_timer))
2933                 set_bit(TMR_RUNNING_CHANSW, &ifmgd->timers_running);
2934
2935         /* these will just be re-established on connection */
2936         del_timer_sync(&ifmgd->conn_mon_timer);
2937         del_timer_sync(&ifmgd->bcn_mon_timer);
2938 }
2939
2940 void ieee80211_sta_restart(struct ieee80211_sub_if_data *sdata)
2941 {
2942         struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
2943
2944         if (!ifmgd->associated)
2945                 return;
2946
2947         if (sdata->flags & IEEE80211_SDATA_DISCONNECT_RESUME) {
2948                 sdata->flags &= ~IEEE80211_SDATA_DISCONNECT_RESUME;
2949                 mutex_lock(&ifmgd->mtx);
2950                 if (ifmgd->associated) {
2951                         mlme_dbg(sdata,
2952                                  "driver requested disconnect after resume\n");
2953                         ieee80211_sta_connection_lost(sdata,
2954                                 ifmgd->associated->bssid,
2955                                 WLAN_REASON_UNSPECIFIED);
2956                         mutex_unlock(&ifmgd->mtx);
2957                         return;
2958                 }
2959                 mutex_unlock(&ifmgd->mtx);
2960         }
2961
2962         if (test_and_clear_bit(TMR_RUNNING_TIMER, &ifmgd->timers_running))
2963                 add_timer(&ifmgd->timer);
2964         if (test_and_clear_bit(TMR_RUNNING_CHANSW, &ifmgd->timers_running))
2965                 add_timer(&ifmgd->chswitch_timer);
2966         ieee80211_sta_reset_beacon_monitor(sdata);
2967
2968         mutex_lock(&sdata->local->mtx);
2969         ieee80211_restart_sta_timer(sdata);
2970         mutex_unlock(&sdata->local->mtx);
2971 }
2972 #endif
2973
2974 /* interface setup */
2975 void ieee80211_sta_setup_sdata(struct ieee80211_sub_if_data *sdata)
2976 {
2977         struct ieee80211_if_managed *ifmgd;
2978
2979         ifmgd = &sdata->u.mgd;
2980         INIT_WORK(&ifmgd->monitor_work, ieee80211_sta_monitor_work);
2981         INIT_WORK(&ifmgd->chswitch_work, ieee80211_chswitch_work);
2982         INIT_WORK(&ifmgd->beacon_connection_loss_work,
2983                   ieee80211_beacon_connection_loss_work);
2984         INIT_WORK(&ifmgd->request_smps_work, ieee80211_request_smps_work);
2985         setup_timer(&ifmgd->timer, ieee80211_sta_timer,
2986                     (unsigned long) sdata);
2987         setup_timer(&ifmgd->bcn_mon_timer, ieee80211_sta_bcn_mon_timer,
2988                     (unsigned long) sdata);
2989         setup_timer(&ifmgd->conn_mon_timer, ieee80211_sta_conn_mon_timer,
2990                     (unsigned long) sdata);
2991         setup_timer(&ifmgd->chswitch_timer, ieee80211_chswitch_timer,
2992                     (unsigned long) sdata);
2993
2994         ifmgd->flags = 0;
2995         ifmgd->powersave = sdata->wdev.ps;
2996         ifmgd->uapsd_queues = IEEE80211_DEFAULT_UAPSD_QUEUES;
2997         ifmgd->uapsd_max_sp_len = IEEE80211_DEFAULT_MAX_SP_LEN;
2998
2999         mutex_init(&ifmgd->mtx);
3000
3001         if (sdata->local->hw.flags & IEEE80211_HW_SUPPORTS_DYNAMIC_SMPS)
3002                 ifmgd->req_smps = IEEE80211_SMPS_AUTOMATIC;
3003         else
3004                 ifmgd->req_smps = IEEE80211_SMPS_OFF;
3005 }
3006
3007 /* scan finished notification */
3008 void ieee80211_mlme_notify_scan_completed(struct ieee80211_local *local)
3009 {
3010         struct ieee80211_sub_if_data *sdata;
3011
3012         /* Restart STA timers */
3013         rcu_read_lock();
3014         list_for_each_entry_rcu(sdata, &local->interfaces, list)
3015                 ieee80211_restart_sta_timer(sdata);
3016         rcu_read_unlock();
3017 }
3018
3019 int ieee80211_max_network_latency(struct notifier_block *nb,
3020                                   unsigned long data, void *dummy)
3021 {
3022         s32 latency_usec = (s32) data;
3023         struct ieee80211_local *local =
3024                 container_of(nb, struct ieee80211_local,
3025                              network_latency_notifier);
3026
3027         mutex_lock(&local->iflist_mtx);
3028         ieee80211_recalc_ps(local, latency_usec);
3029         mutex_unlock(&local->iflist_mtx);
3030
3031         return 0;
3032 }
3033
3034 static int ieee80211_prep_channel(struct ieee80211_sub_if_data *sdata,
3035                                   struct cfg80211_bss *cbss)
3036 {
3037         struct ieee80211_local *local = sdata->local;
3038         struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
3039         int ht_cfreq;
3040         enum nl80211_channel_type channel_type = NL80211_CHAN_NO_HT;
3041         const u8 *ht_oper_ie;
3042         const struct ieee80211_ht_operation *ht_oper = NULL;
3043         struct ieee80211_supported_band *sband;
3044
3045         sband = local->hw.wiphy->bands[cbss->channel->band];
3046
3047         ifmgd->flags &= ~IEEE80211_STA_DISABLE_40MHZ;
3048
3049         if (sband->ht_cap.ht_supported) {
3050                 ht_oper_ie = cfg80211_find_ie(WLAN_EID_HT_OPERATION,
3051                                               cbss->information_elements,
3052                                               cbss->len_information_elements);
3053                 if (ht_oper_ie && ht_oper_ie[1] >= sizeof(*ht_oper))
3054                         ht_oper = (void *)(ht_oper_ie + 2);
3055         }
3056
3057         if (ht_oper) {
3058                 ht_cfreq = ieee80211_channel_to_frequency(ht_oper->primary_chan,
3059                                                           cbss->channel->band);
3060                 /* check that channel matches the right operating channel */
3061                 if (cbss->channel->center_freq != ht_cfreq) {
3062                         /*
3063                          * It's possible that some APs are confused here;
3064                          * Netgear WNDR3700 sometimes reports 4 higher than
3065                          * the actual channel in association responses, but
3066                          * since we look at probe response/beacon data here
3067                          * it should be OK.
3068                          */
3069                         sdata_info(sdata,
3070                                    "Wrong control channel: center-freq: %d ht-cfreq: %d ht->primary_chan: %d band: %d - Disabling HT\n",
3071                                    cbss->channel->center_freq,
3072                                    ht_cfreq, ht_oper->primary_chan,
3073                                    cbss->channel->band);
3074                         ht_oper = NULL;
3075                 }
3076         }
3077
3078         if (ht_oper) {
3079                 channel_type = NL80211_CHAN_HT20;
3080
3081                 if (sband->ht_cap.cap & IEEE80211_HT_CAP_SUP_WIDTH_20_40) {
3082                         switch (ht_oper->ht_param &
3083                                         IEEE80211_HT_PARAM_CHA_SEC_OFFSET) {
3084                         case IEEE80211_HT_PARAM_CHA_SEC_ABOVE:
3085                                 channel_type = NL80211_CHAN_HT40PLUS;
3086                                 break;
3087                         case IEEE80211_HT_PARAM_CHA_SEC_BELOW:
3088                                 channel_type = NL80211_CHAN_HT40MINUS;
3089                                 break;
3090                         }
3091                 }
3092         }
3093
3094         if (!ieee80211_set_channel_type(local, sdata, channel_type)) {
3095                 /* can only fail due to HT40+/- mismatch */
3096                 channel_type = NL80211_CHAN_HT20;
3097                 sdata_info(sdata,
3098                            "disabling 40 MHz due to multi-vif mismatch\n");
3099                 ifmgd->flags |= IEEE80211_STA_DISABLE_40MHZ;
3100                 WARN_ON(!ieee80211_set_channel_type(local, sdata,
3101                                                     channel_type));
3102         }
3103
3104         local->oper_channel = cbss->channel;
3105         ieee80211_hw_config(local, IEEE80211_CONF_CHANGE_CHANNEL);
3106
3107         return 0;
3108 }
3109
3110 static int ieee80211_prep_connection(struct ieee80211_sub_if_data *sdata,
3111                                      struct cfg80211_bss *cbss, bool assoc)
3112 {
3113         struct ieee80211_local *local = sdata->local;
3114         struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
3115         struct ieee80211_bss *bss = (void *)cbss->priv;
3116         struct sta_info *new_sta = NULL;
3117         bool have_sta = false;
3118         int err;
3119
3120         if (WARN_ON(!ifmgd->auth_data && !ifmgd->assoc_data))
3121                 return -EINVAL;
3122
3123         if (assoc) {
3124                 rcu_read_lock();
3125                 have_sta = sta_info_get(sdata, cbss->bssid);
3126                 rcu_read_unlock();
3127         }
3128
3129         if (!have_sta) {
3130                 new_sta = sta_info_alloc(sdata, cbss->bssid, GFP_KERNEL);
3131                 if (!new_sta)
3132                         return -ENOMEM;
3133         }
3134
3135         mutex_lock(&local->mtx);
3136         ieee80211_recalc_idle(sdata->local);
3137         mutex_unlock(&local->mtx);
3138
3139         if (new_sta) {
3140                 u32 rates = 0, basic_rates = 0;
3141                 bool have_higher_than_11mbit;
3142                 int min_rate = INT_MAX, min_rate_index = -1;
3143                 struct ieee80211_supported_band *sband;
3144
3145                 sband = local->hw.wiphy->bands[cbss->channel->band];
3146
3147                 err = ieee80211_prep_channel(sdata, cbss);
3148                 if (err) {
3149                         sta_info_free(local, new_sta);
3150                         return err;
3151                 }
3152
3153                 ieee80211_get_rates(sband, bss->supp_rates,
3154                                     bss->supp_rates_len,
3155                                     &rates, &basic_rates,
3156                                     &have_higher_than_11mbit,
3157                                     &min_rate, &min_rate_index);
3158
3159                 /*
3160                  * This used to be a workaround for basic rates missing
3161                  * in the association response frame. Now that we no
3162                  * longer use the basic rates from there, it probably
3163                  * doesn't happen any more, but keep the workaround so
3164                  * in case some *other* APs are buggy in different ways
3165                  * we can connect -- with a warning.
3166                  */
3167                 if (!basic_rates && min_rate_index >= 0) {
3168                         sdata_info(sdata,
3169                                    "No basic rates, using min rate instead\n");
3170                         basic_rates = BIT(min_rate_index);
3171                 }
3172
3173                 new_sta->sta.supp_rates[cbss->channel->band] = rates;
3174                 sdata->vif.bss_conf.basic_rates = basic_rates;
3175
3176                 /* cf. IEEE 802.11 9.2.12 */
3177                 if (local->oper_channel->band == IEEE80211_BAND_2GHZ &&
3178                     have_higher_than_11mbit)
3179                         sdata->flags |= IEEE80211_SDATA_OPERATING_GMODE;
3180                 else
3181                         sdata->flags &= ~IEEE80211_SDATA_OPERATING_GMODE;
3182
3183                 memcpy(ifmgd->bssid, cbss->bssid, ETH_ALEN);
3184
3185                 /* set timing information */
3186                 sdata->vif.bss_conf.beacon_int = cbss->beacon_interval;
3187                 sdata->vif.bss_conf.sync_tsf = cbss->tsf;
3188                 sdata->vif.bss_conf.sync_device_ts = bss->device_ts;
3189
3190                 /* tell driver about BSSID, basic rates and timing */
3191                 ieee80211_bss_info_change_notify(sdata,
3192                         BSS_CHANGED_BSSID | BSS_CHANGED_BASIC_RATES |
3193                         BSS_CHANGED_BEACON_INT);
3194
3195                 if (assoc)
3196                         sta_info_pre_move_state(new_sta, IEEE80211_STA_AUTH);
3197
3198                 err = sta_info_insert(new_sta);
3199                 new_sta = NULL;
3200                 if (err) {
3201                         sdata_info(sdata,
3202                                    "failed to insert STA entry for the AP (error %d)\n",
3203                                    err);
3204                         return err;
3205                 }
3206         } else
3207                 WARN_ON_ONCE(!ether_addr_equal(ifmgd->bssid, cbss->bssid));
3208
3209         return 0;
3210 }
3211
3212 /* config hooks */
3213 int ieee80211_mgd_auth(struct ieee80211_sub_if_data *sdata,
3214                        struct cfg80211_auth_request *req)
3215 {
3216         struct ieee80211_local *local = sdata->local;
3217         struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
3218         struct ieee80211_mgd_auth_data *auth_data;
3219         u16 auth_alg;
3220         int err;
3221
3222         /* prepare auth data structure */
3223
3224         switch (req->auth_type) {
3225         case NL80211_AUTHTYPE_OPEN_SYSTEM:
3226                 auth_alg = WLAN_AUTH_OPEN;
3227                 break;
3228         case NL80211_AUTHTYPE_SHARED_KEY:
3229                 if (IS_ERR(local->wep_tx_tfm))
3230                         return -EOPNOTSUPP;
3231                 auth_alg = WLAN_AUTH_SHARED_KEY;
3232                 break;
3233         case NL80211_AUTHTYPE_FT:
3234                 auth_alg = WLAN_AUTH_FT;
3235                 break;
3236         case NL80211_AUTHTYPE_NETWORK_EAP:
3237                 auth_alg = WLAN_AUTH_LEAP;
3238                 break;
3239         default:
3240                 return -EOPNOTSUPP;
3241         }
3242
3243         auth_data = kzalloc(sizeof(*auth_data) + req->ie_len, GFP_KERNEL);
3244         if (!auth_data)
3245                 return -ENOMEM;
3246
3247         auth_data->bss = req->bss;
3248
3249         if (req->ie && req->ie_len) {
3250                 memcpy(auth_data->ie, req->ie, req->ie_len);
3251                 auth_data->ie_len = req->ie_len;
3252         }
3253
3254         if (req->key && req->key_len) {
3255                 auth_data->key_len = req->key_len;
3256                 auth_data->key_idx = req->key_idx;
3257                 memcpy(auth_data->key, req->key, req->key_len);
3258         }
3259
3260         auth_data->algorithm = auth_alg;
3261
3262         /* try to authenticate/probe */
3263
3264         mutex_lock(&ifmgd->mtx);
3265
3266         if ((ifmgd->auth_data && !ifmgd->auth_data->done) ||
3267             ifmgd->assoc_data) {
3268                 err = -EBUSY;
3269                 goto err_free;
3270         }
3271
3272         if (ifmgd->auth_data)
3273                 ieee80211_destroy_auth_data(sdata, false);
3274
3275         /* prep auth_data so we don't go into idle on disassoc */
3276         ifmgd->auth_data = auth_data;
3277
3278         if (ifmgd->associated)
3279                 ieee80211_set_disassoc(sdata, 0, 0, false, NULL);
3280
3281         sdata_info(sdata, "authenticate with %pM\n", req->bss->bssid);
3282
3283         err = ieee80211_prep_connection(sdata, req->bss, false);
3284         if (err)
3285                 goto err_clear;
3286
3287         err = ieee80211_probe_auth(sdata);
3288         if (err) {
3289                 sta_info_destroy_addr(sdata, req->bss->bssid);
3290                 goto err_clear;
3291         }
3292
3293         /* hold our own reference */
3294         cfg80211_ref_bss(auth_data->bss);
3295         err = 0;
3296         goto out_unlock;
3297
3298  err_clear:
3299         ifmgd->auth_data = NULL;
3300  err_free:
3301         kfree(auth_data);
3302  out_unlock:
3303         mutex_unlock(&ifmgd->mtx);
3304
3305         return err;
3306 }
3307
3308 int ieee80211_mgd_assoc(struct ieee80211_sub_if_data *sdata,
3309                         struct cfg80211_assoc_request *req)
3310 {
3311         struct ieee80211_local *local = sdata->local;
3312         struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
3313         struct ieee80211_bss *bss = (void *)req->bss->priv;
3314         struct ieee80211_mgd_assoc_data *assoc_data;
3315         struct ieee80211_supported_band *sband;
3316         const u8 *ssidie, *ht_ie;
3317         int i, err;
3318
3319         ssidie = ieee80211_bss_get_ie(req->bss, WLAN_EID_SSID);
3320         if (!ssidie)
3321                 return -EINVAL;
3322
3323         assoc_data = kzalloc(sizeof(*assoc_data) + req->ie_len, GFP_KERNEL);
3324         if (!assoc_data)
3325                 return -ENOMEM;
3326
3327         mutex_lock(&ifmgd->mtx);
3328
3329         if (ifmgd->associated)
3330                 ieee80211_set_disassoc(sdata, 0, 0, false, NULL);
3331
3332         if (ifmgd->auth_data && !ifmgd->auth_data->done) {
3333                 err = -EBUSY;
3334                 goto err_free;
3335         }
3336
3337         if (ifmgd->assoc_data) {
3338                 err = -EBUSY;
3339                 goto err_free;
3340         }
3341
3342         if (ifmgd->auth_data) {
3343                 bool match;
3344
3345                 /* keep sta info, bssid if matching */
3346                 match = ether_addr_equal(ifmgd->bssid, req->bss->bssid);
3347                 ieee80211_destroy_auth_data(sdata, match);
3348         }
3349
3350         /* prepare assoc data */
3351
3352         /*
3353          * keep only the 40 MHz disable bit set as it might have
3354          * been set during authentication already, all other bits
3355          * should be reset for a new connection
3356          */
3357         ifmgd->flags &= IEEE80211_STA_DISABLE_40MHZ;
3358
3359         ifmgd->beacon_crc_valid = false;
3360
3361         /*
3362          * IEEE802.11n does not allow TKIP/WEP as pairwise ciphers in HT mode.
3363          * We still associate in non-HT mode (11a/b/g) if any one of these
3364          * ciphers is configured as pairwise.
3365          * We can set this to true for non-11n hardware, that'll be checked
3366          * separately along with the peer capabilities.
3367          */
3368         for (i = 0; i < req->crypto.n_ciphers_pairwise; i++) {
3369                 if (req->crypto.ciphers_pairwise[i] == WLAN_CIPHER_SUITE_WEP40 ||
3370                     req->crypto.ciphers_pairwise[i] == WLAN_CIPHER_SUITE_TKIP ||
3371                     req->crypto.ciphers_pairwise[i] == WLAN_CIPHER_SUITE_WEP104) {
3372                         ifmgd->flags |= IEEE80211_STA_DISABLE_11N;
3373                         ifmgd->flags |= IEEE80211_STA_DISABLE_VHT;
3374                         netdev_info(sdata->dev,
3375                                     "disabling HT/VHT due to WEP/TKIP use\n");
3376                 }
3377         }
3378
3379         if (req->flags & ASSOC_REQ_DISABLE_HT) {
3380                 ifmgd->flags |= IEEE80211_STA_DISABLE_11N;
3381                 ifmgd->flags |= IEEE80211_STA_DISABLE_VHT;
3382         }
3383
3384         /* Also disable HT if we don't support it or the AP doesn't use WMM */
3385         sband = local->hw.wiphy->bands[req->bss->channel->band];
3386         if (!sband->ht_cap.ht_supported ||
3387             local->hw.queues < IEEE80211_NUM_ACS || !bss->wmm_used) {
3388                 ifmgd->flags |= IEEE80211_STA_DISABLE_11N;
3389                 if (!bss->wmm_used)
3390                         netdev_info(sdata->dev,
3391                                     "disabling HT as WMM/QoS is not supported by the AP\n");
3392         }
3393
3394         /* disable VHT if we don't support it or the AP doesn't use WMM */
3395         if (!sband->vht_cap.vht_supported ||
3396             local->hw.queues < IEEE80211_NUM_ACS || !bss->wmm_used) {
3397                 ifmgd->flags |= IEEE80211_STA_DISABLE_VHT;
3398                 if (!bss->wmm_used)
3399                         netdev_info(sdata->dev,
3400                                     "disabling VHT as WMM/QoS is not supported by the AP\n");
3401         }
3402
3403         memcpy(&ifmgd->ht_capa, &req->ht_capa, sizeof(ifmgd->ht_capa));
3404         memcpy(&ifmgd->ht_capa_mask, &req->ht_capa_mask,
3405                sizeof(ifmgd->ht_capa_mask));
3406
3407         if (req->ie && req->ie_len) {
3408                 memcpy(assoc_data->ie, req->ie, req->ie_len);
3409                 assoc_data->ie_len = req->ie_len;
3410         }
3411
3412         assoc_data->bss = req->bss;
3413
3414         if (ifmgd->req_smps == IEEE80211_SMPS_AUTOMATIC) {
3415                 if (ifmgd->powersave)
3416                         ifmgd->ap_smps = IEEE80211_SMPS_DYNAMIC;
3417                 else
3418                         ifmgd->ap_smps = IEEE80211_SMPS_OFF;
3419         } else
3420                 ifmgd->ap_smps = ifmgd->req_smps;
3421
3422         assoc_data->capability = req->bss->capability;
3423         assoc_data->wmm = bss->wmm_used &&
3424                           (local->hw.queues >= IEEE80211_NUM_ACS);
3425         assoc_data->supp_rates = bss->supp_rates;
3426         assoc_data->supp_rates_len = bss->supp_rates_len;
3427
3428         ht_ie = ieee80211_bss_get_ie(req->bss, WLAN_EID_HT_OPERATION);
3429         if (ht_ie && ht_ie[1] >= sizeof(struct ieee80211_ht_operation))
3430                 assoc_data->ap_ht_param =
3431                         ((struct ieee80211_ht_operation *)(ht_ie + 2))->ht_param;
3432         else
3433                 ifmgd->flags |= IEEE80211_STA_DISABLE_11N;
3434
3435         if (bss->wmm_used && bss->uapsd_supported &&
3436             (sdata->local->hw.flags & IEEE80211_HW_SUPPORTS_UAPSD)) {
3437                 assoc_data->uapsd = true;
3438                 ifmgd->flags |= IEEE80211_STA_UAPSD_ENABLED;
3439         } else {
3440                 assoc_data->uapsd = false;
3441                 ifmgd->flags &= ~IEEE80211_STA_UAPSD_ENABLED;
3442         }
3443
3444         memcpy(assoc_data->ssid, ssidie + 2, ssidie[1]);
3445         assoc_data->ssid_len = ssidie[1];
3446
3447         if (req->prev_bssid)
3448                 memcpy(assoc_data->prev_bssid, req->prev_bssid, ETH_ALEN);
3449
3450         if (req->use_mfp) {
3451                 ifmgd->mfp = IEEE80211_MFP_REQUIRED;
3452                 ifmgd->flags |= IEEE80211_STA_MFP_ENABLED;
3453         } else {
3454                 ifmgd->mfp = IEEE80211_MFP_DISABLED;
3455                 ifmgd->flags &= ~IEEE80211_STA_MFP_ENABLED;
3456         }
3457
3458         if (req->crypto.control_port)
3459                 ifmgd->flags |= IEEE80211_STA_CONTROL_PORT;
3460         else
3461                 ifmgd->flags &= ~IEEE80211_STA_CONTROL_PORT;
3462
3463         sdata->control_port_protocol = req->crypto.control_port_ethertype;
3464         sdata->control_port_no_encrypt = req->crypto.control_port_no_encrypt;
3465
3466         /* kick off associate process */
3467
3468         ifmgd->assoc_data = assoc_data;
3469
3470         err = ieee80211_prep_connection(sdata, req->bss, true);
3471         if (err)
3472                 goto err_clear;
3473
3474         if (!bss->dtim_period &&
3475             sdata->local->hw.flags & IEEE80211_HW_NEED_DTIM_PERIOD) {
3476                 /*
3477                  * Wait up to one beacon interval ...
3478                  * should this be more if we miss one?
3479                  */
3480                 sdata_info(sdata, "waiting for beacon from %pM\n",
3481                            ifmgd->bssid);
3482                 assoc_data->timeout = TU_TO_EXP_TIME(req->bss->beacon_interval);
3483         } else {
3484                 assoc_data->have_beacon = true;
3485                 assoc_data->sent_assoc = false;
3486                 assoc_data->timeout = jiffies;
3487         }
3488         run_again(ifmgd, assoc_data->timeout);
3489
3490         if (bss->corrupt_data) {
3491                 char *corrupt_type = "data";
3492                 if (bss->corrupt_data & IEEE80211_BSS_CORRUPT_BEACON) {
3493                         if (bss->corrupt_data &
3494                                         IEEE80211_BSS_CORRUPT_PROBE_RESP)
3495                                 corrupt_type = "beacon and probe response";
3496                         else
3497                                 corrupt_type = "beacon";
3498                 } else if (bss->corrupt_data & IEEE80211_BSS_CORRUPT_PROBE_RESP)
3499                         corrupt_type = "probe response";
3500                 sdata_info(sdata, "associating with AP with corrupt %s\n",
3501                            corrupt_type);
3502         }
3503
3504         err = 0;
3505         goto out;
3506  err_clear:
3507         ifmgd->assoc_data = NULL;
3508  err_free:
3509         kfree(assoc_data);
3510  out:
3511         mutex_unlock(&ifmgd->mtx);
3512
3513         return err;
3514 }
3515
3516 int ieee80211_mgd_deauth(struct ieee80211_sub_if_data *sdata,
3517                          struct cfg80211_deauth_request *req)
3518 {
3519         struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
3520         u8 frame_buf[DEAUTH_DISASSOC_LEN];
3521
3522         mutex_lock(&ifmgd->mtx);
3523
3524         if (ifmgd->auth_data) {
3525                 ieee80211_destroy_auth_data(sdata, false);
3526                 mutex_unlock(&ifmgd->mtx);
3527                 return 0;
3528         }
3529
3530         sdata_info(sdata,
3531                    "deauthenticating from %pM by local choice (reason=%d)\n",
3532                    req->bssid, req->reason_code);
3533
3534         if (ifmgd->associated &&
3535             ether_addr_equal(ifmgd->associated->bssid, req->bssid)) {
3536                 ieee80211_set_disassoc(sdata, IEEE80211_STYPE_DEAUTH,
3537                                        req->reason_code, true, frame_buf);
3538         } else {
3539                 drv_mgd_prepare_tx(sdata->local, sdata);
3540                 ieee80211_send_deauth_disassoc(sdata, req->bssid,
3541                                                IEEE80211_STYPE_DEAUTH,
3542                                                req->reason_code, true,
3543                                                frame_buf);
3544         }
3545
3546         mutex_unlock(&ifmgd->mtx);
3547
3548         __cfg80211_send_deauth(sdata->dev, frame_buf, DEAUTH_DISASSOC_LEN);
3549
3550         mutex_lock(&sdata->local->mtx);
3551         ieee80211_recalc_idle(sdata->local);
3552         mutex_unlock(&sdata->local->mtx);
3553
3554         return 0;
3555 }
3556
3557 int ieee80211_mgd_disassoc(struct ieee80211_sub_if_data *sdata,
3558                            struct cfg80211_disassoc_request *req)
3559 {
3560         struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
3561         u8 bssid[ETH_ALEN];
3562         u8 frame_buf[DEAUTH_DISASSOC_LEN];
3563
3564         mutex_lock(&ifmgd->mtx);
3565
3566         /*
3567          * cfg80211 should catch this ... but it's racy since
3568          * we can receive a disassoc frame, process it, hand it
3569          * to cfg80211 while that's in a locked section already
3570          * trying to tell us that the user wants to disconnect.
3571          */
3572         if (ifmgd->associated != req->bss) {
3573                 mutex_unlock(&ifmgd->mtx);
3574                 return -ENOLINK;
3575         }
3576
3577         sdata_info(sdata,
3578                    "disassociating from %pM by local choice (reason=%d)\n",
3579                    req->bss->bssid, req->reason_code);
3580
3581         memcpy(bssid, req->bss->bssid, ETH_ALEN);
3582         ieee80211_set_disassoc(sdata, IEEE80211_STYPE_DISASSOC,
3583                                req->reason_code, !req->local_state_change,
3584                                frame_buf);
3585         mutex_unlock(&ifmgd->mtx);
3586
3587         __cfg80211_send_disassoc(sdata->dev, frame_buf, DEAUTH_DISASSOC_LEN);
3588
3589         mutex_lock(&sdata->local->mtx);
3590         ieee80211_recalc_idle(sdata->local);
3591         mutex_unlock(&sdata->local->mtx);
3592
3593         return 0;
3594 }
3595
3596 void ieee80211_mgd_stop(struct ieee80211_sub_if_data *sdata)
3597 {
3598         struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
3599
3600         mutex_lock(&ifmgd->mtx);
3601         if (ifmgd->assoc_data)
3602                 ieee80211_destroy_assoc_data(sdata, false);
3603         if (ifmgd->auth_data)
3604                 ieee80211_destroy_auth_data(sdata, false);
3605         del_timer_sync(&ifmgd->timer);
3606         mutex_unlock(&ifmgd->mtx);
3607 }
3608
3609 void ieee80211_cqm_rssi_notify(struct ieee80211_vif *vif,
3610                                enum nl80211_cqm_rssi_threshold_event rssi_event,
3611                                gfp_t gfp)
3612 {
3613         struct ieee80211_sub_if_data *sdata = vif_to_sdata(vif);
3614
3615         trace_api_cqm_rssi_notify(sdata, rssi_event);
3616
3617         cfg80211_cqm_rssi_notify(sdata->dev, rssi_event, gfp);
3618 }
3619 EXPORT_SYMBOL(ieee80211_cqm_rssi_notify);